@article{GMJ_1995__2_3_47272,
     author = {Bartu\v{s}ek, Miroslav},
     title = {On structure of solutions of a system of four differential inequalities.},
     journal = {Georgian Mathematical Journal},
     pages = {225--236},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {1995},
     zbl = {0824.34014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_1995__2_3_47272/}
}