WILKINSON, A. C. L. Curvature in Areal Coordinates. The Journal of the Indian Mathematical Society, [S. l.], v. 5, n. 5, p. 179–183, 1913. DOI: 10.18311/jims/1913/17727. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/17727. Acesso em: 2 may. 2024.