Manatbayev, R. K., and A. K. Tulepbergenov. “On the Development of a Numerical Method of Calculation Speed Wind Turbine Darrieus”. International Journal of Mathematics and Physics, vol. 4, no. 2, Dec. 2013, pp. 75-80, https://ijmph.kaznu.kz/index.php/kaznu/article/view/82.