Piero Pagliani. Intrinsic Co-Heyting Boundaries and Information Incompleteness in Rough Set Analysis. 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 123-130, Springer, 1998. [doi]