PS

In John Sowa, editors, Principles of Semantic Networks, 299--330, San Mateo, CA, 1991. Morgan Kaufmann.

@incollection{crawford:sn91, title={ALL: formalizing access-limited reasoning}, author={J. M. Crawford and Benjamin J. Kuipers}, booktitle={Principles of Semantic Networks}, editor={John Sowa}, address={San Mateo, CA}, publisher={Morgan Kaufmann}, pages={299--330}, url="http://www.cs.utexas.edu/users/ai-lab/?crawford:sn91", year={1991} }