“…Very useful discussion about neutral systems involving in differential equations, one can refer [10,13,14,17,27,29,35,38]. Differential systems of Sobolev-type appear commonly in mathematical forms of much physical development, for example, in 272 V. VIJAYAKUMAR, R. UDHAYAKUMAR AND K. KAVITHA the fluid flow through fissured rocks, thermodynamics, shear in second-order fluids, etc., one can check [1,2,6,18,23,27,29,41].…”