Jaroslaw Stepaniuk. Approximation Spaces in Extensions of Rough Set Theory. In Lech Polkowski, Andrzej Skowron, editors, Rough Sets and Current Trends in Computing, First International Conference, RSCTC 98, Warsaw, Poland, June 22-26, 1998, Proceedings. Volume 1424 of Lecture Notes in Computer Science, pages 290-297, Springer, 1998. [doi]
Abstract is missing.