repairing some stuff

references.bib

@@ -207,4 +207,17 @@ author = {Rosales, J.C. and García-Sánchez, P. A.},
 urldate = {2026-09-16},
 date = {2009},
 langid = {english},
+}
+
+@book{Bruns1993,
+location = {Cambridge [England] ; New York},
+title = {Cohen-Macaulay rings},
+isbn = {978-0-521-41068-7},
+series = {Cambridge studies in advanced mathematics},
+pagetotal = {403},
+number = {39},
+publisher = {Cambridge University Press},
+author = {Bruns, Winfried and Herzog, Jürgen},
+date = {1993},
+keywords = {Cohen-Macaulay rings},
 }