1. Yu. P. Kitaev and B. I. Buzykin, Hydrazones [in Russian], Moscow (1974).
2. A. N. Kost and I. N. Grandberg, Usp. Khimii,28, No. 8, 921–947 (1959).
3. R. G. Kurmangalieva, I. A. Poplavskaya, and M. I. Lelyukh, Izv. Akad. Nauk Kazakh. SSR, Ser. Khim., No. 1, 52–56 (1984).
4. I. A. Poplavskaya, R. G. Kurmangalieva, S. F. Khalilova, et al., Khim.-farm. Zh., No. 4, 16–21 (1981).
5. I. A. Poplavskaya, R. G. Kurmangalieva, S. F. Khalilova, et al., Khim.-farm. Zh., No. 4, 16–21 (1981) [sic; this reference is identical to the preceding one — Translator].