M. Sargsyan, H. Movsesyan, N. Ghazaryan, A. Sargsyan, and A. Avagyan, “QUANTITIES OF AMMONIFIERS IN BROWN FOREST SOILS AFTER INTRODUCTION OF CRYSTALLOPHORES”, Proc. YSU B: Chem. Biol. Sci., vol. 47, no. 1 (230), pp. 40–43, Mar. 2013.