“…From the literature, it is known that several classes of neutral type differential equations are often encountered in applied problems in natural sciences and engineering, see for example [3] and [11]. Recently, a great deal interest in studying the oscillatory properties of neutral type functional differential equations, see for example [1,2,5,6,9,12,13,14,15,16,17,18,19,20,21] and the references cited therein.…”