1. Skripchinskii, V.V., Fotoperiodizm—ego proiskhozhdenie i evolyutsiya (Photoperiodism: Its Origin and Evolution), Leningrad: Nauka, 1975.
2. Kato, K. and Yokoyama, H., Geographical Variation in Heading Characters among Wheat Landraces, Triticum aestivum L., and Its Implication for Their Adaptability, Theor. Appl. Genet., 1992, vol. 84, pp. 259–265.
3. Udachin, R.A., Biological Characteristics of Winter Wheat in Connection with Selection for Earliness and Productivity, in Rekombinatsionnaya selektsiya rastenii v Sibiri (Recombination Plant Breeding in Siberia), Novosibirsk, 1989, pp. 44–54.
4. Welsh, J., Kein, D., Pirasteh, B., and Richards, R., Genetic Control of Photoperiod Response in Wheat, in Proc. 4th Int. Wheat. Genet. Symp. Agric. Exp. Stat., Missouri: Univ. Press, 1973, pp. 879–884.
5. Borner, A., Korzun, V., and Worland, A., Comparative Genetic Mapping of Loci Affecting Plant Height and Development in Cereals, Euphytica, 1998, vol. 100, pp. 245–248.