Yuqing Wu, Dirk Van Gucht, Marc Gyssens, Jan Paredaens. A Study of a Positive Fragment of Path Queries: Expressiveness, Normal Form, and Minimization. In Alan P. Sexton, editor, Dataspace: The Final Frontier, 26th British National Conference on Databases, BNCOD 26, Birmingham, UK, July 7-9, 2009. Proceedings. Volume 5588 of Lecture Notes in Computer Science, pages 133-145, Springer, 2009. [doi]
Abstract is missing.