@article{UZERU_1997_2_a2,
     author = {S. G. Shahinyan and S. R. Hambardzumyan},
     title = {On the stability for acting forces in the critical case},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {15--20},
     publisher = {mathdoc},
     number = {2},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_1997_2_a2/}
}