1. A. Butenandt and P. Karlson, Z. Naturforschung, 9B(6), 389–391 (1954).
2. J. Koolman, Zool. Science, No. 7, 563–580 (1990).
3. E. A. Krasnov, A. S. Saratikov, and G. D. Yakunina, Khim. Prir. Soedin., No. 4, 550 (1976).
4. V. N. Syrov and A. G. Kurmukov, Farmakol. Toksikol., No. 5. 690–693 (1976).
5. Yu. D. Kholodova, Ukr. Biokhim. Zh., 51(5), 560–575 (1979).