R. G. Savchenko, Ya. R. Urmanova, R. V. Shafikov, S. R. Afonkina, L. M. Khalilov, V. N. Odinokov, “Regio- and stereodirected transformation of 20-hydroxyecdysone to 2-dehydro-3-<i>epi</i>-20-hydroxyecdysone under ozonization in pyridine”, Mendeleev Commun., 18:4 (2008), 191–192
