1. A. K. Gupta, D. G. Lilley, and N. Syred, Swirl Flows (Mir, Moscow, 1987) [in Russian].
2. R. C. Chanaud, J. Fluid Mech. 21(1), 111 (1965).
3. D. G. Akhmetov, V. V. Nikulin, and V. M. Petrov, Izv. Akad. Nauk, Ser. Mekh. Zhidk. Gaza, No. 3, 60 (2004).
4. W. J. Rheingans, Trans. ASME 62(3), 171 (1940).
5. M. Murakami, Trans. ASME. Ser. A 83(1), 36 (1961).