@article{700188,
     title = {On oscillation of solutions of linear ordinary differential equations},
     booktitle = {Equadiff 6},
     series = {GDML\_Books},
     publisher = {J. E. Purkyn\v e University, Department of Mathematics},
     address = {Brno},
     year = {1986},
     pages = {[431]-434},
     mrnumber = {MR0881668},
     url = {http://dml.mathdoc.fr/item/700188}
}

Chanturia, Teimuraz A. On oscillation of solutions of linear ordinary differential equations, dans Equadiff 6, GDML_Books,  (1986), pp. [431]-434. http://gdmltest.u-ga.fr/item/700188/