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3.14 Yasos

(require 'oop) or (require 'yasos) `Yet Another Scheme Object System' is a simple object system for Scheme based on the paper by Norman Adams and Jonathan Rees: Object Oriented Programming in Scheme, Proceedings of the 1988 ACM Conference on LISP and Functional Programming, July 1988 [ACM #552880].

Another reference is:

Ken Dickey.
Scheming with Objects
AI Expert Volume 7, Number 10 (October 1992), pp. 24-33.