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Cetus Links: CLOS
http://www.cetus-links.org/oo_clos.html
Links to general LISP information, including newsgroups and mailing lists.
Implementation of DBC
http://www.muc.de/%7ehoelzl/tools/dbc/dbc.lisp
Document and source code on implementation of DBC for CLOS.
MetaObject Protocol: MOP
http://www.alu.org/mop/index.html
CLOS MOP specification.