@article{IVM_2000_5_a1,
     author = {M. K. Bugir},
     title = {Conditions for the nonoscillation of solutions of systems of second-order differential equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {12--18},
     publisher = {mathdoc},
     number = {5},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2000_5_a1/}
}