1. K. Ponder, Amer. Journ. Physiol.,12, 99 (1935).
2. H. Lozacheke, R. Wever, Pfliigers, Arch. f. d. gez. Physiol.,25, 533 (1951).
3. K. S. Shifrin, and A. Ya. Perel'man, Opt. i Spektr.,15, No. 4, 533, No. 5, 667, No. 6, 803 (1963);16, No. 1, 117 (1964);20, No. 1, 143 (1966)
4. K. S. Shifrin and A. Ya. Perel'man, Tr. GGO, No. 1, 3, Gidrometeoizdat, Leningrad (1965).
5. K. S. Shifrin, Light Scattering in Turbid Medium [in Russian], GITTL, Moscow-Leningrad (1951).