1 files changed, 39 insertions, 0 deletions
diff --git a/python/notes/wikipedia_citations_2020-07-14.md b/python/notes/wikipedia_citations_2020-07-14.md
index d079312..7eca025 100644
--- a/python/notes/wikipedia_citations_2020-07-14.md
+++ b/python/notes/wikipedia_citations_2020-07-14.md
@@ -49,3 +49,42 @@ Most referenced on WP:
 * https://git.archive.org/webgroup/fatcat/-/blob/10eb30251f89806cb7a0f147f427c5ea7e5f9941/proposals/2021-01-29_citation_api.md
 * `source_wikipedia_article: Optional[str]`
 
+
+About 29M citations. IDlist uses various id types:
+
+```
+$ cat minimal_dataset.json |
+    jq -rc 'select(.ID_list != null) | .ID_list' |
+    tr ',' '\n' |
+    tr -d '{}' |
+    sed -e 's@^ *@@' |
+    cut -d '=' -f 1 |
+    sort |
+    uniq -c |
+    sort -nr
+```
+
+Except artifacts:
+
+```
+2160818 ISBN
+1442176 DOI
+ 825970 PMID
+ 353425 ISSN
+ 279369 PMC
+ 185742 OCLC
+ 181375 BIBCODE
+ 110920 JSTOR
+  47601 ARXIV
+  15202 LCCN
+  12878 MR
+   8270 ASIN
+   6293 OL
+   3790 SSRN
+   3013 ZBL
+    413 OSTI
+    357 JFM
+    277 USENETID
+     85 RFC
+     78 ISMN
+```