RussellSpitzer commented on code in PR #10981:
URL: https://github.com/apache/iceberg/pull/10981#discussion_r1767634355


##########
format/spec.md:
##########
@@ -383,6 +388,13 @@ Notes:
 3. Strings are truncated to a valid UTF-8 string with no more than `L` code 
points.
 4. In contrast to strings, binary values do not have an assumed encoding and 
are truncated to `L` bytes.
 
+### XZ2 Transform Details
+
+XZ2 is based on the paper [XZ-Ordering: A Space-Filling Curve for Objects with 
Spatial 
Extensions](https://www.dbs.ifi.lmu.de/Publikationen/Boehm/Ordering_99.pdf).

Review Comment:
   Dead link, can we get a reference to ArchiveX or something stable?
   
   I found one other reference that works here, 
   https://www.dbs.ifi.lmu.de/Publikationen/Papers/SSD-XZ-Order.final.pdf
   
   But Universities are generally terrible at keeping their links up



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