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- [1] FIXPOINT EXTENSIONS OF 1ST-ORDER LOGIC AND DATALOG-LIKE LANGUAGES FOURTH ANNUAL SYMPOSIUM ON LOGIC IN COMPUTER SCIENCE, 1989, : 71 - 79
- [2] GENERALIZATION OF THE 1ST-ORDER LOGIC PERIODICA POLYTECHNICA-ELECTRICAL ENGINEERING, 1978, 22 (2-3): : 157 - 170
- [9] PROBABILISTIC SEMANTICS FOR 1ST-ORDER LOGIC ZEITSCHRIFT FUR MATHEMATISCHE LOGIK UND GRUNDLAGEN DER MATHEMATIK, 1979, 25 (06): : 497 - 509