YANAN ZHU, YIZHAN DU, YU CHENG SHEN 2025. MODELING MOTIVATIONAL DYNAMICS IN UNIVERSITY ENGLISH LEARNING USING THE ARCS FRAMEWORK AND RUNGE-KUTTA METHODS . TPM – Testing, Psychometrics, Methodology in Applied Psychology. 32, S6(2025): Posted 15 Sept (Sep. 2025), 1560–1564.