AYDIN, M. E.; ERGUT, M. Isotropic geometry of graph surfaces associated with product production functions in economics. Tamkang Journal of Mathematics, [S. l.], v. 47, n. 4, p. 433–443, 2016. DOI: 10.5556/j.tkjm.47.2016.2152. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/2152. Acesso em: 6 may. 2024.