عرب حمادة الطائي س. Distortion in the Projections and the Systems of Coordinates. College of Basic Education Research Journal, [S. l.], v. 10, n. 3, p. 331–354, 2011. Disponível em: https://stats.uomosul.edu.iq/index.php/berj/article/view/38752. Acesso em: 26 oct. 2025.