Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Matteo Baldoni, Laura Giordano, Alberto Martelli. A Modal Extension of Logic Programming: Modularity, Beliefs and Hypothetical Reasoning. Journal of Logic and Computation, 8(5):597-635, 1998.