@article{UZERU_2003_3_a7,
     author = {S. R. Hambardzumyan},
     title = {On the stability by acting force with pair imagining roots for the second order system},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {50--56},
     publisher = {mathdoc},
     number = {3},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2003_3_a7/}
}