1. [2] W. E. Becker . Condominium Conversion Workshop. Atlanta, Georgia. Executive Seminars. 28 -29, 1980 .
2. Effects of Collapsing Multidimensional Contingency Tables
3. [5] Y. M. M. Bishop, S. E. Fienberg, and P. W. Holland . Discrete Multivariate Analysis: Theory and Practice . M.I.T. Press, 1975 .