Poole, David; Goebel, Randy; Aleliunas, Romas (1987). "Theorist: A Logical Reasoning System for Defaults and Diagnosis". In Nick J. Cercone; Gordon McCalla (eds.). The Knowledge Frontier – Essays in the Representation of Knowledge. Symbolic Computation (1st ed.). New York, NY: Springer. pp. 331–352. doi:10.1007/978-1-4612-4792-0. ISBN978-1-4612-9158-9. S2CID38209923.
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Poole, David; Goebel, Randy; Aleliunas, Romas (1987). "Theorist: A Logical Reasoning System for Defaults and Diagnosis". In Nick J. Cercone; Gordon McCalla (eds.). The Knowledge Frontier – Essays in the Representation of Knowledge. Symbolic Computation (1st ed.). New York, NY: Springer. pp. 331–352. doi:10.1007/978-1-4612-4792-0. ISBN978-1-4612-9158-9. S2CID38209923.