1. Brockmann H, Bauer K (1950) Naturwissenschaften 37:492
2. Brockmann H (1963) Fortsch Chem Org Naturst 21:121
3. Ollis WD, Sutherland IO (1961) In: Ollis WD (ed) Chemistry of natural phenolic compounds. Pergamon, London, p 212
4. Grein A, Spalla C, DiMarco A, Canevazzi G (1963) Giorn Microbiol 11:109
5. Dubost M, Ganter P, Maval R, Ninet L, Pinneret S, Preud'Homme J, Werner GH (1963) CR Acad Sci 257:1813