L. Naish, U Melbourne. A Prolog with 'when' declarations, the successor to MU-Prolog. Type-checked. "NU-Prolog Reference Manual - Version 1.3", J.A. Thom et al eds, TR 86/10, U Melbourne (1988). Available (but not free). (See PNU-Prolog). E-mail: jas@mulga.oz.au .
NU-PROLOG
Meaning of NU-PROLOG in English
FOLDOC computer English dictionary. Английский словарь по компьютерам FOLDOC. 2012