@article{00978042,
title = {On oscillatory properties of second order systems of ordinary differential equations.},
journal = {Memoirs on Differential Equations and Mathematical Physics},
volume = {6},
year = {1995},
pages = {122-124},
zbl = {0866.34024},
language = {en},
url = {http://dml.mathdoc.fr/item/00978042}
}
Lomtatidze, A.; Partsvania, N. On oscillatory properties of second order systems of ordinary differential equations.. Memoirs on Differential Equations and Mathematical Physics, Tome 6 (1995) pp. 122-124. http://gdmltest.u-ga.fr/item/00978042/