@article{1181072265,
author = {Mawhin, Jean},
title = {Oscillatory Properties of Solutions and Nonlinear Differential Equations with Periodic Boundary Conditions},
journal = {Rocky Mountain J. Math.},
volume = {25},
number = {4},
year = {1995},
pages = { 7-37},
language = {en},
url = {http://dml.mathdoc.fr/item/1181072265}
}
Mawhin, Jean. Oscillatory Properties of Solutions and Nonlinear Differential Equations with Periodic Boundary Conditions. Rocky Mountain J. Math., Tome 25 (1995) no. 4, pp. 7-37. http://gdmltest.u-ga.fr/item/1181072265/