KORZYUK, V. I.; LEMESHEVSKY, S. V. Problems on conjugation of polytypic equations. Mathematical Modelling and Analysis, [S. l.], v. 6, n. 1, p. 106–116, 2001. DOI: 10.3846/13926292.2001.9637150. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/9889. Acesso em: 9 may. 2025.