B. Levy

The refractive significance of the nictitating membrane of the bird eye

W. Bobier, J. Sivak, B. Levy, 1978, Journal of comparative physiology.

Environmental influence on shape of the crystalline lens: the amphibian example.

J. Sivak, R. Glover, A. Weber, 1985, Experimental biology.

Mechanisms of accommodation in the bird eye

J. Sivak, B. Levy, JACOB G. Sivak, 1980, Journal of comparative physiology.