1. Amer;BRADEN, A.W.H.;Nature (Lond.),1958
2. Quart;CHI, H.H.; TENG, c C.; KATZIN, H.M.;Ibid,1965
3. System of Ophthalmology;DESVIGNES, P.; V.I.G.O.;Bull. Soc. Ophtal. Fr,1955
4. Amer;DUNN, L.C.;Naturalist,1960
5. ERIKSSON, A. W., VAINIO-MATTILA, B., KRAUSE, U., FELLMAN, j., and FORSIUS, H. (1967) Hereditas (Lund), 57, 373