LUMBANTORUAN, J. H. Evaluation of Students’ Difficulties in Learning Mathematics in Complex Variable Material. Journal of Education Research and Evaluation, [S. l.], v. 7, n. 3, p. 443–454, 2023. DOI: 10.23887/jere.v7i3.60532. Disponível em: https://ejournal.undiksha.ac.id/index.php/JERE/article/view/60532. Acesso em: 16 aug. 2024.