Shapoval, S. P., O. T. Vozniak, and M. Ye. Yaniv. 2010. “Increase of Efficiency of Discrete Orientation of Solar Collectors”. Visnyk of Vinnytsia Politechnical Institute, no. 3 (November):64-66. https://visnyk.vntu.edu.ua/index.php/visnyk/article/view/1684.