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2. Tsovyan J.V., Petrossyan M.T., Zakaryan N.E., Muradyan L.A. "Cytokinin activity of potato stolons and tubers in the formation period". Proc. of YSU, 2,128-133, 1983 (in Russian).

3. Zakaryan N.E., Tsovyan J.V., Virabyan A.R., Muradyan L.A. "Influence of mother-tuber on some features of condition and functions of photosynthetic apparatus of leaves". Proc. of YSU, 3, 96-101, 1983 (in Russian).

4. Zakaryan N.E., Tsovyan J.V., Virabyan A.R. "About significance of different forms of clorophyll in photosynthetic process". Proc. of YSU, 2(165), 137-142, 1987 (in Russian).

5. Tsovyan J.V., Petrossyan M.T., Zakaryan N.E., Kotikyan J.M." The role of mother tuber in the process of tuberization".Biological J. of Ar-me-nia, 10 (40), 843-847, 1987 (in Russian).