Muhlia V. A, Galindo E. I, Lemoyne L. L. A computational procedure for the determination of the optical air-mass. Geofis Int [Internet]. 1971 Apr. 1 [cited 2024 May 17];11(2):77-89. Available from: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1626