1. E. I. Zhitova et al., in the book: Proceedings of a Conference on the Use of Pyramidine Derivatives in Oncology and Other Fields of Medicine [in Russian], Leningrad (1963), p. 36.
2. B. A. Lavrov, Vopr. Pitaniya, No. 6, 68 (1962).
3. Yu. N. Tokarev, Farmakol. i Toksikol., No. 2, 168 (1959).
4. F. B. Straub, Biochemistry [in Russian], Budapest (1963), p. 318.