“…In recent years, many papers discussed analytical stability and numerical stability of delay differential equations (DDEs) (see [3,[11][12][13][14]17,18,20,32,33] and the references therein), neutral delay differential equations (NDDEs) (see [1,2,9,19,[22][23][24][25][26]38] and the references therein) and delay integro-differential equations (DIDEs) (see [6,10,15,16,34,35] and the references therein). A significant number of important results have already been found.…”