%0 Journal Article %A S. R. Hambardzumyan %T On the stability by acting force with pair imagining roots for the second order system %J Proceedings of the Yerevan State University. Physical and mathematical sciences %D 2003 %P 50-56 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/UZERU_2003_3_a7/ %G ru %F UZERU_2003_3_a7