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The article you're looking for is http://www.cs.yale.edu/publications/techreports/tr1049.pdf - Two of the top three (out of ten) solutions were made in Haskell, one by a beginner.

It would be interesting to see the full source code for the various entries - am I missing a place to acquire them?

Yep, that's the one! Looks like there were lots of problems with the experiment but good to read regardless.