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3. Sarkissyan S.H., Cholakhyan D.P., Torjan I.Kh. "Ultrastructure of fertile and sterile pollen grains of Persica vulgaris Mill.", XII Inter. Conf. of Botany,1, 269,Leningrad, 1975 (in Russian).

4. Popov Yu.G., Shamtsyan M.G., Aghajanyan J.A., Sarkissyan S.H., Galstyan H.G. "Nitrogenase activity and ultrastructure of association of callus of alfalfa and soya with nodule bacteria."Abs. of VII Colloq. on nitrogen fixation, Tbilisi, 1983 (in Russian).

5. Sarkissyan S.A., Galstyan A.G., Shamtsyan M.G., Aghajanyan J.A., Popov Yu.G. "Submicroscopic organization of the association of callus cultures of leguminous plants with the specific strains of nodule bacteria". Biological J. of Armenia, 1 (45), 49-54,1992 (in Russian).