1. CIBA*, Swiss. Pat. 235910 (issued 1945); C.A. 1949 7056.
2. Mamoli, Gazz. 69 240, 242, 244.
3. Marker, Lawson, f. Am. Ch. Soc. 61 852.
4. a CIBA* (Miescher, Wettstein), Swed. Pat. 103744 (issued 1942); Ch. Ztbl. 1942 II 2294; Belgian Pat. 440403 (issued 1941); Ch. Ztbl 1942 I 2037; Fr. Pat. 886410 (issued 1943); Ch. Ztbl. 1944 I 448; CIBA PHARMACEUTICAL PRODUCTS (Miescher, Wettstein), U.S. Pat. 2319012 (issued 1943); C.A. 1943 6096.
5. b CIBA*, Swiss Pat. 235279 (issued1945); C.A. 1949 7649.