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* Michael Beeler, [[Bill Gosper]], [https://en.wikipedia.org/wiki/Richard_Schroeppel Rich Schroeppel] ('''1972'''). ''[httphttps://homedspace.pipelinemit.comedu/~hbaker1handle/hakmem1721.1/hakmem.html 6086 HAKMEM]'', Memo 239''. [https://en.wikipedia.org/wiki/MIT_Computer_Science_and_Artificial_Intelligence_Laboratory CSAIL], Artificial Intelligence Laboratory, [[Massachusetts Institute of Technology|MIT]] <ref>Web-available by [http://home.pipeline.com/~hbaker1/ Henry Baker]</ref>