1. Rogers, V.B., On the formation of rotating rings by air and fluids under certain condition of discharge, Amer. J. Sci. Arts. Second Ser. 1858, vol. 26, pp. 246–258.
2. Worthington, A.M., On impact with a fluid surface, Proc. Roy. Soc. London, 1882, vol. 34, no. 2, pp. 217–230.
3. Thomson, J.J. and Newall H.F., On the formation of vortex rings by drops falling into fluids, and some allied phenomena, Proc. Roy. Soc. London, 1885, vol. 29, pp. 417–436.
4. Thompson, D.W., On Growth and Form, Dover, 1992.
5. Stepanova, E.V. and Chashechkin, Yu.D., Marker transport in a composite vortex, Fluid Dyn., 2010, vol. 45, no. 6, pp. 843–858.