Differential Equations & Applications · Volume 8, Issue 1 Existence of positive solution and new oscillation criteria for nonlinear first-order neutral delay differential equations 08-03 Pages 33-51 DOI 10.7153/dea-08-03 Downloads Short PDF Full PDF PNG Authors Shyam Sundar Santra Keywords oscillation nonoscillation non-linear delay neutral differential equations asymptotic behaviour existence of positive solution Knaster-Tarski fixed point theorem Banach fixed point theorem Subject classes 34C10 34C15 34K40