Group-Size Depencence: A Rationale for Choice Between Numerical Classifications. - W. T. Williams; H. T. Clifford; G. N. Lance (Comput. J., 1971)

Controversy Concerning the Criteria for Taxonometric Strategies. - W. T. Williams; G. N. Lance; Mike B. Dale; H. T. Clifford (Comput. J., 1971)