research and productivity / Robert E. Evenson and Yoav Kislev. Evenson, Robert E. (Robert Eugene), 1934- Kislev, Yoav, 1932- joint author. Agriculture Research Economic aspects Mathematical models. Agriculture Economic aspects Mathematical models. S540.A2 E9 338.072 KHR Includes index. Bibliography: p. 195-200. New Haven : Yale University Press, 1975. 1975. 1975 Text 143 p. : eng A Publication of the Economic Growth Center, Yale University Publication of the Economic Growth Center, Yale University.