Differential Equations & Applications · Volume 4, Issue 3 Oscillation and nonoscillation criteria for even order nonlinear functional differential equations 04-20 Pages 339-370 DOI 10.7153/dea-04-20 Downloads Short PDF Full PDF PNG Authors Akihito Shibuya Keywords even order nonlinear differential equations oscillation nonoscillation regularly varying Subject classes 34C10 26A12