ALP N, SARIKAYA MZ. On (p, q)-Opial type inequalities for (p, q)-calculus. Stud. Univ. Babeş-Bolyai Math. [Internet]. 2021 Dec. 30 [cited 2025 Sep. 1];66(4):641–657. Available from: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1401