KJELLMAN, A. From descriptivism to constructivism ‐ a challenge to symbolic modeling. II. Mathematical Modelling and Analysis, [S. l.], v. 4, n. 1, p. 98–113, 1999. DOI: 10.3846/13926292.1999.9637115. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/9974. Acesso em: 28 jun. 2025.