1. M. V. Rubtsov and L. N. Yakhontov, in: Principal Trends of Research at the All-Union Scientific-Research Chemico-Pharmaceutical Institute (Review of activities for 1920–1957) [in Russian], Moscow (1959), p. 281.
2. L. N. Yakhontov, Adv. Heterocycl. Chem.,11, 473 (1970).
3. M. D. Mashkovsky and L. N. Yakhontov, Prog. Drug. Res.,13, 293 (1969).
4. L. N. Yakhontov, Heterocycles,7, 1033 (1977).
5. E. E. Mikhlina and L. N. Yakhontov, Khim. Geterotsikl. Soedin., 1011 (1975).