Marker; Lawson Journal of the American Chemical Society, 1938 , vol. 60, p. 2438,2439 Journal of the American Chemical Society, 1939 , vol. 61, p. 586,587 Full Text Show Details Marker Journal of the American Chemical Society, 1938 , vol. 60, p. 1897,1900 Full Text Show Details David Acta Brevia Neerlandica de Physiologia, Pharmacologia, Microbiologia E. A, 1938 , vol. 8, p. 211,213 Chem. Zentralbl., 1939 , vol. 110, # I p. 3898