Mikhalev К. А., and Shelpyakov А. Н. “Determination of Optimal Geometric Parameters of Vortex Ejector”. Vestnik IzhGTU Imeni M.T. Kalashnikova, no. 1, Mar. 2014, pp. 4-7, https://izdat.istu.ru/index.php/vestnik/article/view/2481.