Bag-based data models for incomplete information and their closure properties.Published in:Journal of Intelligent Information Systems, 2008, v. 30, n. 2, p. 115, doi. 10.1007/s10844-006-0020-1By:Yamaguchi, Akinari;Shimizu, Shougo;Ishihara, Yasunori;Fujiwara, ToruPublication type:Article