SUPRA: A Sampling-Query Optimization Method for Large-Scale OLAP. - Kazutomo Ushijima; Shinji Fujiwara; Itaru Nishizawa; Nobutoshi Sagawa (DEXA Workshop, 1998)

Proposal and Evaluation of Policy Description for Information Lifecycle Management. - Tetsuo Tanaka; Kazutomo Ushijima; Ryoichi Ueda; Ichiro Naitoh; Toshiko Aizono; Norihisa Komoda (CIMCA/IAWTIC, 2005)