1. Muraour, H., Chimie et Industrie, 47, 3 (1942), where a bibliography of earlier papers on the subject is given. Mémorial de l' Artillerie française, 20, 141, 405, 675 (1946); 23, 867 (1949); C.R. Acad. Sci., Paris, 224, 695 (1947); “Cahiers de Physique”, 29–30, 51 (1947).
2. Cybulski, W. B., Payman, W., and Woodhead, D. W., Proc. Roy. Soc., A, 197, 51 (1949).