1. Kel’reiter, I., A proposal of the culture of new bastard tobacco with red flowers and its description,in Kel’reiter, I., Uchenie o pole i gibridizatsii rastenii (Field Doctrine and the Plant Hybridization), Moscow: OGIZ-Sel’khozgiz 1940, pp. 61—69.
2. Bateson, B., William Bateson, F.R.S. Naturalist: His Essays and Addresses, Together with a Short Account of His Life, Cambridge: Cambridge Univ. Press, 1928.
3. Lotsy, J.P., Evolution by Means of Hybridization, The Hague: Martinus Nijhoff, 1916.
4. Popov, M.G., Geographical and morphological method of systematics and hybridization processes in nature, Tr. Prikl. Bot.,
Genet. Sel., 1927, vol. 17, no. 1, pp. 221—290.
5. Popov, M.G., Osnovy florogenetiki (Basics of Florogenetics), Moscow: Akad. Nauk SSSR, 1963.