Misc cleanup

docs/oscar_references.bib

@@ -123,7 +123,6 @@ @Article{BCL21
   year          = {2021},
   month         = {Sep},
   doi           = {10.1103/PhysRevD.104.L061903},
-  url           = {https://link.aps.org/doi/10.1103/PhysRevD.104.L061903},
   issue         = {6},
   numpages      = {8}
 }
@@ -1096,7 +1095,7 @@ @InCollection{GJ00
   title         = {polymake: a Framework for Analyzing Convex Polytopes},
   editor        = {Kalai, Gil and Ziegler, Günter M.},
   booktitle     = {Polytopes --- Combinatorics and Computation},
-  note          = {https://polymake.org},
+  note          = {\url{https://polymake.org}},
   publisher     = {Birkhäuser},
   pages         = {43--74},
   year          = {2000},
@@ -1176,7 +1175,6 @@ @Misc{GSS22
   author        = {Daniel R. Grayson and Alexandra Seceleanu and Michael E. Stillman},
   title         = {Computations in intersection rings of flag bundles},
   year          = {2022},
-  url           = {https://arxiv.org/abs/1205.4190},
   eprint        = {1205.4190},
   archiveprefix = {arXiv},
   primaryclass  = {math.AG}
@@ -1832,7 +1830,7 @@ @Book{Mar18
   author        = {Marcus, Daniel A.},
   title         = {Number fields},
   series        = {Universitext},
-  note          = {Second edition of [ MR0457396], With a foreword by Barry Mazur},
+  note          = {Second edition of [MR0457396], With a foreword by Barry Mazur},
   publisher     = {Springer, Cham},
   pages         = {xviii+203},
   year          = {2018},