A. G. Imana and Y. S. . Nugroho, “UX (USER EXPERIENCE) EVALUATION OF THE OPENLEARNING SYSTEM AT UNIVERSITAS MUHAMMADIYAH SURAKARTA USING HEURISTIC EVALUATION AND USABILITY TESTING”, J. Tek. Inform. (JUTIF), vol. 4, no. 4, pp. 681–691, Aug. 2023.