K. HUSSEIN, Ali; A. ALSHAMARTI, Hussein. Using a weighted least squares method to estimate of optimum observation for GPS. Journal of Kufa-Physics, Kufa, Najaf, IRAQ, v. 7, n. 1, 2015. Disponível em: https://journal.uokufa.edu.iq/index.php/jkp/article/view/7317. Acesso em: 8 aug. 2026.