Manatbayev, R.K., Georgiev, A., Popov, R., Dzhonova-Atanasova, D., А.А., Kuikabayeva, AND Zulbukharova, E.M.. "The effect of design parameters on energy characteristics of Darrieus rotor" International Journal of Mathematics and Physics [Online], Volume 7 Number 1 (9 October 2016)