TY - JOUR A1 - Rumbaugh, D. M. A1 - McCormack, C. T1 - Attentional skills of great apes compared with those of Gibbons and Squirrel Monkeys JF - C. R. Carpenter (Ed.) Behaviour, New York and Basel (S. Karger) 1969, pp. 167-172. Y1 - 1969 ER - TY - JOUR A1 - Rumbaugh, D. M. T1 - The transfer index. An alternitive measure of learning set JF - C. R. Carpenter (Ed.) Behaviour, New York and Basel (S. Karger) 1969, pp. 267-273. Y1 - 1969 ER -