Michinori Nakata, Hiroshi Sakai, Keitarou Hara. Rough Sets in Incomplete Information Systems with Order Relations Under Lipski's Approach. In Lech Polkowski, Yiyu Yao, Piotr Artiemjew, Davide Ciucci, Dun Liu, Dominik Slezak, Beata Zielosko, editors, Rough Sets - International Joint Conference, IJCRS 2017, Olsztyn, Poland, July 3-7, 2017, Proceedings, Part I. Volume 10313 of Lecture Notes in Computer Science, pages 487-506, Springer, 2017. [doi]