Thomas Lengauer, Dirk Theune. Unstructured Path Problems and the Making of Semirings (Preliminary Version). In Frank K. H. A. Dehne, Jörg-Rüdiger Sack, Nicola Santoro, editors, Algorithms and Data Structures, 2nd Workshop WADS 91, Ottawa, Canada, August 14-16, 1991, Proceedings. Volume 519 of Lecture Notes in Computer Science, pages 189-200, Springer, 1991.
Abstract is missing.