1.
J Comp Physiol Psychol
; 87(2): 237-48, 1974 Aug.
Article
in English
| MEDLINE
| ID: mdl-4430740
2.
J Comp Physiol Psychol
; 78(1): 91-101, 1972 Jan.
Article
in English
| MEDLINE
| ID: mdl-5027346