“…Based on composition, completeness, Banach fixed point theorem, and change of variables theorems, we proved two very important results concerning the existence and uniqueness of a single measure paa solution of a new scalar integro-differential system. Compared to previous works, this is first study of oscillations and dynamics of single measure paa solutions for certain integro-differential equations with reflection for the case when bðtÞ 6 ¼ t: Miraoui [30] studied pap solutions with two measures for our equation (3) for the case when K ¼ 0 or h ¼ 0 and bðtÞ ¼ t: Ait Dads et al [9] described equation ( 3) with matrix coefficients for the case when bðtÞ ¼ t: On the other hand, we studied the impact of functions K, f, h and b on the uniqueness of the single measure paa solutions for equation (3). Note that in the special case when b(t) ¼ t, hypotheses (M0) and (h0) are satisfied, therefore the following new results can be deduced from Theorems 1.1 and 1.2.…”