73. Kurt Maly and Hank Warren. SRTL: User's guide to the SETL Run Time Library. Revision 3, 16 May 1973.

73. Kurt Maly and Hank Warren. SRTL: User's guide to the SETL Run Time Library. Revision 3, 16 May 1973. "The SETL Run Time Library is a collection of subroutines and macros, written in the LITTLE language, that are capable of evaluating SETL expressions. Subroutines are provided to build sets, test SETL objets for equality, concatenate strings, etc. The library includes a storage allocation mechanism that is based on a compacting garbage collector."

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