The following publications are possibly variants of this publication:
- Common Lisp Object System Specification: 2. Functions in the Programmer InterfaceDaniel G. Bobrow, Linda G. DeMichiel, Richard P. Gabriel, Sonya E. Keene, Gregor Kiczales, David A. Moon. lisp, 1(3-4):299-394, 1989.
- Common Lisp Object System Specification: 1. Programmer Interface ConceptsDaniel G. Bobrow, Linda G. DeMichiel, Richard P. Gabriel, Sonya E. Keene, Gregor Kiczales, David A. Moon. lisp, 1(3-4):245-298, 1989.