Zbigniew Suraj. Some Remarks on Extensions and Restrictions of Information Systems. In Wojciech Ziarko, Y. Y. Yao, editors, Rough Sets and Current Trends in Computing, Second International Conference, RSCTC 2000 Banff, Canada, October 16-19, 2000, Revised Papers. Volume 2005 of Lecture Notes in Computer Science, pages 204-211, Springer, 2000. [doi]
Abstract is missing.