Hueter, R.E. & Murphy, C.J. & Howland, M. & Sivak, J.G. & Paul-Murphy, J.R. & Howland, H.C. (2001)
Refractive state and accommodation in the eyes of free-swimming versus restrained juvenile lemon sharks (Negaprion brevirostris). Vision Research, 41(15), 1885–1889
DOI: 10.1016/S0042-6989(01)00064-5
Pardue, M.T. & Luer, C.A. & Callender, M.G. & Chou, B.R. & Sivak, J.G. (1995)
The absence of a photopic influence on the refractive development of the embryonic eye of the clearnose skate (Raja eglanteria). Vision Research, 35(12), 1675–1678
DOI: 10.1016/0042-6989(94)00265-N
Sivak, J.G. (1991)
Elasmobranch Visual Optics. Journal of Experimental Zoology, Supplement, 5, 13–21
Sivak, J.G. & Luer, C.A. (1991)
Optical development of the ocular lens of an elasmobranch, Raja eglanteria. Vision Research, 31(3), 373–382
DOI: 10.1016/0042-6989(91)90090-R
Gilbert, P.W. & Sivak, J.G. & Pelham, R.E. (1981)
Rapid pupil change in selachians. Canadian Journal of Zoology, 59(3), 560–564
DOI: 10.1139/z81-081
Sivak, J.G. (1978)
Optical characteristics of the eye of the spiny dogfish (Squalus acanthias). Revue Canadienne de Biologie, 37(3): 209–217
Sivak, J.G. (1978)
Refraction and accommodation of the elasmobranch eye. In E.S. Hodgson & Mathewson, R.F. (Eds.), Sensory biology of sharks, skates and rays. (pp. 107–116). Office of Naval Research, Washington, D.C.
Sivak, J.G. & Gilbert, P.W. (1976)
Refractive and histological study of accommodation in two species of sharks (Ginglymostoma cirratum and Carcharhinus milberti). Canadian Journal of Zoology, 54(11), 1811–1817
DOI: 10.1139/z76-211
Sivak, J.G. (1976)
The accommodative significance of the "ramp" retina of the eye of the stingray. Vision Research, 16(9), 945–950
DOI: 10.1016/0042-6989(76)90225-X
Sivak, J.G. (1974)
Accommodations of the lemon shark eye (Negaprion brevirostris). Vision Research, 14(2), 215–216
DOI: 10.1016/0042-6989(74)90103-5