1. Mashkovskii, M.D., Lekarstvennye sredstva (Drugs), Moscow: Novaya volna, 2002.
2. Fieser, L. and Fieser, M., Steroids, London: Reinholt, 1959.
3. Akhrem, A.A. and Titov, Yu.Ya., Steroidy i mikroorganizmy (Steroids and Microorganisms), Moscow: Nauka, 1970.
4. Nagu, E.U., Vartho, I., Hantos, G., Trinn, M., Vida, Z., Szejtli, J., Stadler, A., Habon, I., and Valazs, M., GB Patent, 1983, GB 2 108 965.
5. Akhrem, A.A. and Voishvillo, N.E., Prikl. Biokhim. Mikrobiol., 1970, vol. 6, no. 6, pp. 654–659.