T. A. . Prayudha, D. . Banjarnahor, A. . Rochman, S. M. . Ikhsan, and A. N. F. . Naridha, “The regulator’s dilemma in proving algorithmic cartels against the principle of fair competition in the digital economy era”, PSSJ, vol. 5, no. 12, pp. 164–176, Dec. 2025.