Coping with Indefinite and Negative Data in Deductive Databases: A Survey. - P. Chisholm; G. Chen; D. Ferbrache; Peter Thanisch; M. Howard Williams (Data Knowl. Eng., 1987)

Prolog and deductive databases. - M. Howard Williams; G. Chen; D. Ferbrache; P. A. Massey; S. Salvini; Hamish Taylor; Kam-Fai Wong (Knowl. Based Syst., 1988)