1. G. J. Ranque, J. Phys. Radium 4, 112 (1933).
2. R. Hilsch, Zeitchrift fur Naturforschung, Jan, 1946.
3. A. P. Merkulov, Vortex Effect and Its Application in Technology (Mashinostroenie, Moscow, 1969) [in Russian].
4. A. D. Suslov, S. V. Ivanov, A. V. Murashkin, and Yu. V. Chizhikov, Vortex Equipments (Mashinostroenie, Moscow, 1985) [in Russian].
5. A. K. Gupta, D. G. Lilley, and N. Syred, Swirl Flows (Abacus, Tunbridge Wells, Kent, 1984; Mir, Moscow, 1987).