@article{DE_2003_39_2_a10,
     author = {J. Hay},
     title = {Necessary {Conditions} for the {Existence} of {Global} {Solutions} of {Systems} of {Higher-Order} {Nonlinear} {Ordinary} {Differential} {Equations} and {Inequalities}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {246--252},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_2_a10/}
}