1. The national history of migraine; some observations and hypothesis;Graham;Trans Am Clin Clim Ass,1952
2. Discrete Multivariate Analysis: Theory and Practice;Bishop,1975
3. Discrete Multivariate Analysis: Theory and Practice;Bishop,1975
4. Discrete Multivariate Analysis: Theory and Practice;Bishop,1975
5. Measures of association for cross-classifications III: approximate sampling theory;Goodman;J Am Stat Ass,1963