Liko AKR, Du T-S. SOME NEW OSTROWSKI TYPE FRACTIONAL INTEGRAL INEQUALITIES FOR BETA (r, g)-PREINVEX FUNCTIONS VIA CAPUTO k-FRACTIONAL DERIVATIVES. Mat. Bilt. [Internet]. 2019 Jan. 1 [cited 2026 Jun. 13];43(1). Available from: https://bilten.smm.org.mk/index.php/bilten/article/view/1873