AMUR, K. S. On some Invariants Associated with a Rectilinear Congruence. The Journal of the Indian Mathematical Society, [S. l.], v. 27, n. 1, p. 33–44, 1963. DOI: 10.18311/jims/1963/16859. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/16859. Acesso em: 29 apr. 2024.