1. M.M. Coombs, T.S. Bhatt, Cyclopenta[a]phenanthrenes: Polycyclic Aromatic Compounds Structurally Related to Steroids, Cambridge University Press, Cambridge, 1987, ISBN 0-521-30123-8.
2. The presence of a trifluoromethyl rather than a methyl substituent in the bay-region greatly decreases the DNA-binding and tumour-initiating activities of the cyclopenta[a]phenanthren-17-ones;Boyd;Carcinogenesis,1995
3. Untersuchungen uber die krebserzengende Wirksarnkeit der methylhomologen des 1,2-cyclopenteno-phenanthrenes;Butenandt;Arch. Geschwulstforsch.,1953
4. The carcinogenicity of 15,16-dihydro-11-methylcyclopenta[a] phenanthren-17-one;Coombs;Br. J. Cancer,1979
5. The relative carcinogenic activities of a series of 5-methylchrysene derivatives;Coombs;Cancer Res.,1974