Shakun, L. S., Motrich, V. D., & Melykjants, S. M. (2017). CALCULATE METHOD OF THE TWILIGHT SKY BRIGHTNESS IN THE SOLAR VERTICAL, STIPULATED BY A MULTIPLE SCATTERING OF A SUNLIGHT. Одеські астрономічні публікації, 17, 78–81. https://doi.org/10.18524/1810-4215.2004.17.93260