Re: [Haskell-cafe] OT: Paper on increasing entropy in software systems

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I was just listening to Brooks' talk at OOPSLA 2007 and in the Q&A part at the end he mentions a paper on increasing entropy in software systems. He mentions the authors' names but I can't quite make it out and Google hasn't been very helpful either. He says the paper “must be 30 years old” and it sounds like he says it's by Les Bellati and Manny Leimann (Lehmann?).

Wikipedia's entry for "Software entropy" lists this:

Lehman M.M. and Belady L. (1985). Program Evolution. Process of Software Change.

No link, though.

http://www.amazon.com/exec/obidos/ASIN/0124424406 Using the author names provided by Ketil, scholar.google.com also finds this: http://www.research.ibm.com/journal/sj/153/ibmsj1503E.pdf