1. Glay, P., Mentcer, C.: C. R. Soc. Biol.139, 1055 (1945); Lednicer, D., et al.: J. Med. Chem.8, 52 (1965); Lednicer, D., Lyster, S.C., Duncan, G.W.: ibid.8, 725 (1965)
2. Grover, P.K., et al.: ibid.8, 720 (1965)
3. Thompson, C.R., Wener, H.W.: Proc. Soc. Exp. Biol. Med.77, 494 (1951)
4. Tyagi, A., et al.: Ind. J. Expt. Biol.3/4, EB 1158 (1979)
5. Pechmann Ber.17, 929 (1894)