S. Goodfriend

Cohesive and dispersal behaviors: two classes of concomitant change in psychotherapy.

L. Horowitz, H. Sampson, E. Siegelman, 1978, Journal of consulting and clinical psychology.

The prototype as a construct in abnormal psychology: 2. Clarifying disagreement in psychiatric judgments.

L. Horowitz, E. Siegelman, O. Renik, 1981, Journal of abnormal psychology.