citation tweak

CITATION.cff

@@ -64,3 +64,9 @@ preferred-citation:
     and analysis of large biomolecular structures
   type: article
   doi: 10.1093/nar/gkab314
+  journal: "Nucleic Acids Research"
+  issue: W1
+  volume: 49
+  year: 2021
+  month: 7
+  pages: "W431–W437"
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