1. Bodanszky, A., Kollonitsch, J.:Color reagent for paper chromatography of steroids. Nature 175: 729, 1955.
2. Bush, I. E.:The chromatography of steroids, London, Pergamon Press, 1961.
3. Chen, C., Wheeler, J., Tewell, M. E.:Methods of estimation of adrenal cortical steroids with tetrazolium salts. J. Lab. clin. Med. 42: 749, 1953.
4. Čapek, A., Hanč, O., Macek, K., Tadra, M., Riedl-Tůmová, E.:Das Studium der Überführung von Progesteron in Testololacton. Naturwissenschaften 43: 571, 1956.
5. Čapek, A., Hanč, O., Pavlů, H.:The study of transformation of steroids by strains of genus Aspergillus. Čs. mikrobiol. 2: 168, 1957.