F. Hezenci, H. Kara, and H. Budak, “New results on Bullen-type inequalities for coordinated convex functions obtained by using conformable fractional integrals”, Ukr. Mat. Zhurn., vol. 76, no. 11, pp. 1691–1712, Nov. 2024, doi: 10.3842/umzh.v76i11.7989.