- Keeling, S.L. and Geretschläger, R, Using Variational and PDE Methods for the Existence of Origami Models with Given Boundary Conditions, Proceedings of 7OSME, 2018. pdf.
- Reishofer, G., Koschutnig, K., Langkammer, C., Porter, D., Jehna, M., Enzinger, C., Keeling, S.L. and Ebner, F., Time-optimized high-resolution readout-segmented diffusion tensor imaging. PLoS One, Vol. 8, No. 9, Sep 3, 2013.
- Keeling, S.L., Katsaounis, T.D. and Plexousakis, M., Consistent Discretizations for Vanishing Regularization Solutions to Image Processing Problems. pdf
- Keeling, S.L. and Kunisch, K., Robust L1 Approaches to Computing the Geometric Median and Principal and Independent Components, Journal of Mathematical Imaging and Vision, Vol. 40, No. 1, pp. 120-145, 2011. pdf
- Reishofer, G., Koschutnig, K., Enzinger, C., Ischebeck, A., Keeling, S.L., Stollberger, R. and Ebner, F., Automated macrovessel artifact correction in dynamic susceptibility contrast magnetic resonance imaging using independent component analysis, Magn Reson Med. Vol. 65, No. 3, pp. 848 - 857, 2011.
- Hofer, M. Keeling, S.L., Reishofer, G., Stollberger, R., Rectal Tumor Registration based on Virtual Templates, ISPA 2011, Dubrovnik, Croatia, Sept. 4 - 6, 2011.
- Hofer, M., Reishofer, G., Keeling, S.L., Riccabona, M., Aschauer, M. and Stollberger, R., Virtual Template Registration for DCE-MRI Renography, ISMRM Annual Meeting, Montreal, Canada, 7. - 13. Mai, 2010.
- Fürtinger, S. Keeling, S.L., Plank, G., Prassel, A.J., Registration of Edges Sets for Mapping a Purkinje Fiber Network onto an Endocardium, SFB-Report 2010-036, Graz, Austria, 2010. pdf
- Kasumba, H. Keeling, S.L., Müller, M., Decay Estimate Addendum to: Revision of the Theory of Tracer Transport and the Convolution Model of DCE-MRI, SFB-Report 2010-022, Graz, Austria, 2010. pdf
- Prassl, A.J., Keeling, S.L., Hofer, E., Plank, G., Reintegration of an endocardial Purkinje system into an anatomically realistic 3D rabbit ventricular geometry, BMT Annual Meeting, 2010.
- Keeling, S.L., Hintermüller, M., Knoll, F., Kraft, D., Laurain, A., A Total Variation Based Approach to Correcting Surface Coil Magnetic Resonance Images, SFB-Report 2010-016, Graz, Austria, 2010. To appear in Applied Mathematics and Computation. pdf
- Keeling, S.L., Propst, G., Stadler, G, Wackernagel, W., A Mathematical Model of the Deformation of the Eyeball by an Elastic Band, Mathematical Medicine and Biology, Vol. 29, pp. 165-183, 2009. Also appeared as SFB-Report 2009-002, Graz, Austria, 2009. pdf
- Hintermüller, M., Keeling, S.L., Image registration and segmentation based on energy minimization, in Handbook of Optimization in Medicine, Series: Springer Optimization and its Applications, Vol. 26, Pardalos, P.M., Romeijn, H.E. (editors), 2009. pdf
- Keeling, S.L., Kogler, T., Stollberger, R., Deconvolution for DCE-MRI Using an Exponential Approximation Basis, Medical Image Analysis, Vol. 13, pp. 80-90, 2009. pdf
- Hintermüller, M., Keeling, S.L., Laurain, A., Modulation recovery and image reconstruction in MRI: a structural study by parameterization, SFB-Report 2008-023, Graz, Austria, 2008. pdf
- Keeling, S.L., Clason, C., Hintermüller, M., Knoll, F., Laurain, A., Von Winckel, G., An Image Space Approach to Cartesian Based Parallel MR Imaging with Total Variation Regularization, SFB-Report 2008-022, Graz, Austria, 2008. To appear in Medical Image Analysis. pdf
- Knoll, F., Ebner,F., Keeling, S.L. and Stollberger, R., Assessment of Image Reconstruction Methods for Subsampled DCE-MRI, ISMRM, Toronto, May 3-9, 2008.
- Knoll, F., Ebner,F., Keeling, S.L. and Stollberger, R., Compressed Sensing Reconstruction for Subsampled DCE-MRI, Austrian, Italian, Slovenian and Croatian Medical Physics Meeting, Graz, May 30 -- 31, 2008.
- Keeling, S.L., Generalized Rigid and Generalized Affine Image Registration and Interpolation by Geometric Multigrid, Journal of Mathematical Imaging and Vision, Vol. 29, pp. 163-183, 2007. pdf
- Keeling, S.L., Image Similarity Based on Intensity Scaling, Journal of Mathematical Imaging and Vision, Vol. 29, pp. 21-34, 2007. pdf
- Keeling, S.L., Haase, G., Geometric Multigrid for High-Order Regularizations of Early Vision Problems, Applied Mathematics and Computation, Vol. 184, pp. 536-556, 2007. pdf
- Reishofer, G., Fazekas, F., Keeling, S.L., Enzinger, C., Payer, F., Simbrunner, J., Stollberger, R., Minimizing Macrovessel Signal in Cerebral Perfusion Imaging using Independent Component Analysis, MRM, Vol. 57, No. 2, pp. 278 - 288, 2007.
- Keeling, S.L., Bammer, R., Stollberger, R., Revision of the Theory of Tracer Transport and the Convolution Model of Dynamic Contrast Enhanced Magnetic Resonance Imaging, Journal of Mathematical Biology, Vol. 55, pp. 389-411, 2007. pdf
- Keeling, S.L., Regularization Formulations and Numerical Solutions for Image Processing, Habilitation Summary, accepted by the Karl-Franzens-Universität Graz, 2006. pdf
- Keeling, S.L., Medical Image Registration and Interpolation by Optical Flow with Maximal Rigidity, in Mathematical Models for Registration and Applications to Medical Imaging, Scherzer, O. (editor), Springer, Berlin, 2006.
- Burton, R., Plank, G., Schneider, J.E., Grau, V., Ahammer, H. Keeling, S.L., Lee, J., Smith, N., Gavaghan, D., Trayanova, N. and Kohl, P., Three-Dimensional Models of Individual Cardiac Histo-Anatomy: Tools and Challenges, Annals of the New York Academy of Sciences, Vol. 1080 No. 4, pp. 301-319, October 2006. [Fulltext] [PubMed]
- Keeling, S.L., Ring, W., Medical Image Registration and Interpolation by Optical Flow with Maximal Rigidity, Journal of Mathematical Imaging and Vision, Vol. 23, No. 1, pp. 47-65, July 2005. Also appeared as SFB Report No. 248, Karl-Franzens-University of Graz, Graz, Austria, May, 2003. pdf
- Keeling, S.L., Bammer, R., Kogler, T., Stollberger, R., On the Convolution Model of Dynamic Contrast Enhanced Magnetic Resonance Imaging and Nonparametric Deconvolution Approaches, SFB Report No. 298, Karl-Franzens-University of Graz, Graz, Austria, April, 2004.
- Reishofer, G., Enzinger, C., Fazekas, F., Keeling, S.L., Stollberger, R., Improved Visibility of Hemodynamic Parameter Maps Using ICA Corrected DCE-MRI Time Series, ISMRM Workshop on Quantitative Cerebral Perfusion Imaging Using MRI: A Technical Perspective, Venice, Italy, March 21-23, 2004.
- Keeling, S.L. and Bammer, R., A Variational Approach to Magnetic Resonance Coil Sensitivity Estimation, Applied Mathematics and Computation, Vol. 158, No. 2, pp. 53-82, 2004. Also appeared in part as SFB Report No. 207, Karl-Franzens-University of Graz, Graz, Austria, December 2000. pdf
- Keeling, S.L., Total Variation Based Convex Filters for Medical Imaging, Applied Mathematics and Computation, Vol. 139, pp. 101-119, 2003. Also appeared as SFB Report No. 206, Karl-Franzens-University of Graz, Graz, Austria, December 2000. pdf
- Keeling, S.L. and Stollberger, R., Nonlinear Anisotropic Diffusion Filters for Multiscale Edge Enhancement, Inverse Problems, Vol. 18, pp. 175-190, January 2002. Also appeared as SFB Report No. 180, Karl-Franzens-University of Graz, Graz, Austria, January 2000, and in part at SPIE International Symposium on Medical Imaging, San Diego, CA, February 12-18, 2000. pdf
- Bammer, R., M. Auer, Keeling, S.L., M. Augustin, L.A. Stables, R.W. Prokesch, R. Stollberger, M.E. Moseley, F. Fazekas, Diffusion Tensor Imaging Using Single-Shot SENSE-EPI, MRM, Vol. 48, No. 1, pp. 128-136, July 2002.
- Bammer, R., Keeling, S.L., Augustin, M., Pruessmann, K.P., Wolf, R., Stollberger, R., Hartung, H., Fazekas, F., Improved Diffusion-Weighted Single-Shot Echo-Planar Imaging in Stroke using Sensitivity Encoding, MRM, Vol. 46, No. 3, pp 548-554, September 2001.
- Keeling, S.L. and Bammer, R., Variational Based Coil Sensitivity Estimation, ISMRM, Glasgow, April 21-27, 2001.
- Bammer, R., Keeling, S.L., Auer, M., Pruessmann, K.P., Roeschmann, P., Stollberger, R., Fazekas, F., Diffusion Tensor Imaging using SENSE-Single-Shot EPI, ISMRM, Glasgow, April 21-27, 2001.
- Bammer, R., Keeling, S.L., Augustin, M., Pruessmann, K.P., Leussler, C., Fazekas, F., Improved Diffusion-Weighted Single-Shot EPI in Stroke using SENSE, ISMRM, Glasgow, April 21-27, 2001.
- Bammer, R., Keeling, S.L., Augustin, M., Pruessmann, K.P., Leussler, C. and Fazekas, F., Improved Diffusion-Weighted Single-Shot EPI in Stroke using SENSE, ISMRM, Glasgow, April 21 -- 27, 2001.
- Keeling, S.L., Bammer, R., Fazekas, F., and Stollberger, R., Total Variation Denoising for Improved Diffusion Tensor Calculation, ISMRM, Denver, CO, April 1-7, 2000.
- Keeling, S.L. and Stollberger, R., Nonlinear Anisotropic Diffusion Filters for Wide Range Edge Sharpening, SPIE, San Diego, CA, February 12 - 18, 2000.
- Bowers, P.L., Dietz, W.E. and Keeling, S.L., Fast Algorithms for Generating Delaunay Interpolation Elements for Domain Decomposition, SFB Report No. 139, Karl-Franzens-University of Graz, Graz, Austria, September, 1998.
- B.G. Fitzpatrick and S.L. Keeling, On Approximation in Total Variation Penalization for Image Reconstruction, Numerical Functional Analysis and Optimization, Vol. 18, Nos. 9 and 10, pp. 941 - 958, 1997. pdf
- Keeling, S.L., Tramel, R.W. and Benek, J.A., A Theoretical Framework for Chimera Domain Decomposition, Advances in Flow Simulation Techniques-a Conference Dedicated to the Memory of Professor Joseph L. Steger, UC Davis, May 2-4, 1997. pdf
- Dietz, W.E., Donegan, T.L., Keeling, S.L. and Thoms, R.D., A Generalization of the Chimera Method to Arbitrary Mesh Structures and Interfaces, Third Symposium on Overset Composite Grid and Solution Technology, Los Alamos, NM, November 18-20, 1996.
- Keeling, S.L., Ly, H.V., Pinter, G.A., Rogers, K.A., Rosario, R.C.D. and Vaughan, D.E., , IMMW, CRSC, North Carolina State University, Raleigh, NC, August 7-16, 1995, CRSC-TR96-7, 1996.
- Keeling, S.L., Clearance Calculations and Collision Detection with Applications to Store Trajectory Analysis and Wind Tunnel Testing, AEDC-TR-95-26, Arnold Engineering Development Center, Arnold Air Force Base, TN, March 1996.
- Keeling, S.L., Fitzpatrick, B.G. and Rock, S.G., A Bounded Variation Approach to Inverse Interferometry, Fifteenth ASME Biennial Conference on Mechanical Vibration and Noise, Boston, MA, September 17-21, 1995.
- Rock, S.G., Tramel, R.W. and Keeling, S.L., NEDANA: A Three-Dimensional Thermochemical Nonequilibrium Chimera-Based Flow Solver, AEDC-TR-94-18, Arnold Engineering Development Center, Arnold Air Force Base, TN, July 1995.
- Keeling, S.L., Tramel, R.W. and Benek, J.A., A Theoretical Framework for Chimera Domain Decomposition, Sixth International Symposium on Computational Fluid Dynamics, Lake Tahoe, Nevada, September 4 - 8, 1995.
- Sickles, W.L., Rist, M.J., Morgret, C.H., Parthasarathy, K.N. and Keeling, S.L., Separation of the Pegasus XL from an L-1011 Aircraft, Paper No. AIAA-94-3454, AIAA Atmospheric Flight Mechanics Conference, Scottsdale, AZ, August 1-3, 1994.
- Keeling, S.L., Notes on Active Noise Control, North Carolina State University, Raleigh, North Carolina, CRSC-TR94-15, 1994.
- Keeling, S.L., A Critical Evaluation of Methods for Imposing Solid Wall Boundary Conditions in Inviscid Flow, AEDC-TR-93-23, Arnold Engineering Development Center, Arnold Air Force Base, TN, March 1994.
- Keeling, S.L., A Strategy for the Optimal Design of Nozzle Contours, Paper No. AIAA-93-2720, AIAA 28th Thermophysics Conference, Orlando, FL, July 6-9, 1993. Best Paper Award. pdf
- Tramel, R.W., Keeling, S.L. and Fox, J.H., A One-Dimensional Inviscid Nonequilibrium Flow Solver, 16th Southeastern Conference on Theoretical and Applied Mechanics, Nashville, TN, April 13-15, 1992.
- Tramel, R.W., Keeling, S.L. and Fox, J.H., One-Dimensional Flow Solver for High Temperature Flows with Nonequilibrium Chemistry Effects, AEDC-TMR-91-P11, Arnold Engineering Development Center, Arnold Air Force Base, TN, September 1991.
- Keeling, S.L., A Guide for Computing Flows Around Tactical Aircraft Configurations, AEDC-TR-90-24, Arnold Engineering Development Center, Arnold Air Force Base, TN, April 1991.
- Keeling, S.L., On Lipschitz Continuity of Nonlinear Differential Operators, SIAM Journal of Numerical Analysis, Vol. 27, No. 2, pp. 385-393, April 1990. pdf
- Keeling, S.L., Galerkin/Runge-Kutta Discretizations for Semilinear Parabolic Equations, SIAM Journal Numerical Analysis, Vol. 27, No. 2, pp. 394-418, April 1990. pdf
- Keeling, S.L., On Implicit Runge-Kutta Methods Having a Stability Function with Only Real Poles, BIT, Vol. 29, pp. 91-109, 1989. pdf
- Keeling, S.L., Galerkin/Runge-Kutta Discretizations for Parabolic Equations with Time Dependent Coefficients, Mathematics of Computation, Vol. 52, No. 186, pp. 561-586, April 1989. pdf
- Banks, H.T., Keeling, S.L., Silcox, R.J. and Wang, C., Linear Quadratic Tracking Problems in Hilbert Space: Application to Optimal Active Noise Suppression, Proceedings of the Fifth IFAC Symposium on Control of Distributed Parameter Systems, Perpignan, France, June 1989.
- Banks, H.T., Keeling, S.L., Silcox, R.J., Active Control of Propeller Induced Noise Fields, CRSC Report No. CRSC-TR94-16, North Carolina State University, Raleigh, NC, October, 1994, appeared in part in Proceedings of the IEEE Twenty-Seventh Conference on Decision and Control, Austin, Texas, December 7-9, 1988. pdf
- Banks, H.T., Keeling, S.L. and Wang, C., Linear Quadratic Tracking Problems in Infinite Dimensional Hilbert-Spaces and a Finite Dimensional Approximation Framework, Proceedings of the Twenty-Seventh IEEE Conference on Decision and Control, Austin, Texas, December 7-9, 1988.
- Banks, H.T., Keeling, S.L. and Silcox, R.J., Optimal Control Techniques for Active Noise Suppression, Proceedings of the Twenty-Seventh IEEE Conference on Decision and Control, Austin, Texas, December 7-9, 1988.
- Keeling, S.L., Dissertation for Ph.D. in Mathematics: Galerkin/Runge-Kutta Discretizations for Parabolic Partial Differential Equations, 1986.
- Keeling, S.L., Thesis for M.S. in Biomedical Engineering: An Investigation of the Multipole Approach in Inverse Electrocardiography, 1981.
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