Aftab Ahmad, Mukhtar Ahmad, Yuhani Binti Yusof, Muhammad Muawwaz, Muhammad Maaz, and Ather Qayyum. “An Extension of Caputo’s K-Fractional Derivative Operator and Its Applications”. Jordan Journal of Mathematics and Statistics, vol. 18, no. 4, Dec. 2025, pp. 651-66, https://jjms.yu.edu.jo/index.php/jjms/article/view/1525.