“…The problem of oscillation of differential equations without "maxima" has been widely studied by many authors, who have provided many methods for obtaining oscillatory and asymptotic behavior of solutions of various types of differential equations, see for example [7,8,9,10,11,12,13,14,19]. However, the oscillation theory of neutral differential equations with "maxima" received less attention eventhough such equations arise in many applications, see for example [1,3,4,5,6,15,16,17,18,20], and the references contained therein.…”