JENALIYEV, M.T.; KASSYMBEKOVA, A.S.; YERGALIYEV, M.G. On two four-dimensional curl operators and their applications. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 118, n. 2, p. 106–121, 2025. DOI: 10.31489/2025m2/106-121. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/909. Acesso em: 10 jul. 2025.