BerksonG.Stereotyped movements of mental defectives: V. Ward behavior and its relation to an experimental task. Amer. J. ment. Def., 1964, 69, 253–264.
2.
BerksonG.MasonW. A.Stereotyped behaviors of chimpanzees: Relation to general arousal and alternative activities. Percept. mot. Skills, 1964, 19, 635–652.
3.
Fitz-GeraldF. L.The effects of drugs upon stereotyped behavior in young chimpanzees. Unpublished Ph.D. dissertation, McGill Univer., 1964.