@article{05816464, title = {Oscillation criteria for second-order delay, difference, and functional equations.}, journal = {International Journal of Differential Equations}, volume = {2010}, year = {2010}, doi = {10.1155/2010/598068}, zbl = {1207.34082}, language = {en}, url = {http://dml.mathdoc.fr/item/05816464} }
Kikina, L.K.; Stavroulakis, I.P. Oscillation criteria for second-order delay, difference, and functional equations.. International Journal of Differential Equations, Tome 2010 (2010) . doi : 10.1155/2010/598068. http://gdmltest.u-ga.fr/item/05816464/