Gultekin Özsoyoglu JiYoung Chung Tzong-An Su Information loss in three cell-level control techniques for summary tables. 179-212 1993 70 Inf. Sci. 3 http://dx.doi.org/10.1016/0020-0255(93)90077-Y db/journals/isci/isci70.html#OzsoyogluCS93