Clustering Opinion Polarity of Student's Strategies as Clues for Motivation. - Julio César Quintana-Zaez; Luis A. Quintero-Domínguez; Jarvin A. Antón Vargas; Julio Sorí Gómez; Nicolás Quintana Bernabé (Int. J. Comb. Optim. Probl. Informatics, 2024)