@article{702177,
     title = {On some qualitative methods for systems of ordinary diferential equations in the large},
     booktitle = {Differential Equations and Their Applications},
     series = {GDML\_Books},
     publisher = {Publishing House of the Czechoslovak Academy of Sciences},
     address = {Prague},
     year = {1963},
     pages = {105-120},
     mrnumber = {MR0171047},
     zbl = {0137.28201},
     url = {http://dml.mathdoc.fr/item/702177}
}

Nemyckiĭ, V. V. On some qualitative methods for systems of ordinary diferential equations in the large, dans Differential Equations and Their Applications, GDML_Books,  (1963), pp. 105-120. http://gdmltest.u-ga.fr/item/702177/