Journal of the American Chemical Society, , vol. 60, p. 2438,2439 Journal of the American Chemical Society, , vol. 61, p. 586,587 Journal of the American Chemical Society, , vol. 60, p. 1897,1900 Acta Brevia Neerlandica de Physiologia, Pharmacologia, Microbiologia E. A, , vol. 8, p. 211,213 Chem. Zentralbl., , vol. 110, # I p. 3898