L. A. Chilingaryan, B. P. Mnatsakanyan, and K. A. Aghababyan, “WATER-RESOURCES CHARACTERISTICS OF LAKE SEVAN IN THE COURSE OF DEVELOPMENT OF THE PROBLEMS OF THE LAKE”, Proc. YSU C: Geol. Geogr. Sci., vol. 40, no. 1 (209), pp. 134–141, Mar. 2006.