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+# Known issues
+
+Both the clustering and verification stage are not perfect. Here, some known
+cases are documented.
+
+# Clustering
+
+# Verification
+
+## A new approach to fault-tolerant wormhole routing for mesh-connected parallel computers
+
+* https://fatcat.wiki/release/izaz6gjnfzhgnaetizf4bt2r24
+* https://fatcat.wiki/release/vwfepcqcdzfwjnsoym7o5o75yu
+
+## Book-Chapter yields VERSIONED DOI
+
+```
+$ python -m fuzzycat verify-single | jq .
+{
+  "extra": {
+    "q": "https://fatcat.wiki/release/search?q=Beardmore"
+  },
+  "a": "https://fatcat.wiki/release/zrkabzp4vjbwfdixvjkohgeh3a",
+  "b": "https://fatcat.wiki/release/ojcucauvkvhg5cazfhzplcot7q",
+  "r": [
+    "strong",
+    "versioned_doi"
+  ]
+}
+```
+
+* https://fatcat.wiki/release/zrkabzp4vjbwfdixvjkohgeh3a (book)
+* https://fatcat.wiki/release/ojcucauvkvhg5cazfhzplcot7q (chapter)