1. R. J. Anderson, Fortschr. Chem. org. Naturstoffe3, 145 (1939). — Chem. Reviews29, 225 (1941).
2. F. B. Seibert, Bacter. Reviews5, 69 (1941).
3. Lit. s. b.F. Roulet undM. Brenner, Zbl. ges. Tuberk. forsch.56, 193 (1944).
4. E. Küster undTh. Wagner-Jauregg, Biochem. Z.317, 256 (1944).
5. E. Bergmann undL. Haskelberg, J. chem. Soc. 1(1939);