%0 Conference Paper %B Workshop on Deductive Databases and Logic Programming %D 1994 %T Expressive Power of Non-Deterministic Operators for Logic-based Languages %A Luca Corciulo %A Fosca Giannotti %A Dino Pedreschi %A Carlo Zaniolo %B Workshop on Deductive Databases and Logic Programming %P 27-40 %G eng %0 Conference Paper %B DOOD %D 1993 %T Datalog with Non-Deterministic Choice Computes NDB-PTIME %A Luca Corciulo %A Fosca Giannotti %A Dino Pedreschi %B DOOD %P 49-66 %G eng