“…Recently, several authors have extended their research by combining integral inequalities with interval-valued functions (IVFs), one can see Chalco-Cano et al [11], Román-Flores et al [12], Flores-Franulič et al [13], Zhao et al [14,15], An et al [16]. As a further extension, more and more Hermite-Hadamard type inequalities involving interval Riemann-Liouville type fractional integral have been obtained for different classes of IVFs, see for interval convex functions [17], for interval harmonically convex functions [18] and the references therein.…”