KASHURI, A., & LIKO, R. (2018). Ostrowski type fractional integral operators for generalized (r; g, s, m, ϕ)-preinvex functions. Studia Universitatis Babeș-Bolyai Mathematica, 63(2), 155–173. https://doi.org/10.24193/subbmath.2018.2.01