C. Dijkman

States, Syndromes, and Polythetic Classes: the Operationalization of Cross-Classification Analysis in Behavioral Science Research

Karl M. van Meter, K. V. van Meter, Charles D. Kaplan, 1987 .

Consensus in patient-therapist interactions. A measure of the therapeutic relationship related to outcome.

M. Dormaar, Marten W. de Vries, C. Dijkman, 1989, Psychotherapy and psychosomatics.