• Vortex rings in a viscous fluid : asymptotic theory and numerical simulationsKaplanski, Felix; Fukumoto, Yasuhide; Sazhin, SergeiEUROMECH Fluid Mechanics Conference 7 : University of Manchester, 14-18 September 2008 : abstracts2008 / p. 169 : ill https://www.researchgate.net/profile/Felix-Kaplanski/publication/278299986_Vortex_rings_in_a_viscous_fluid_Asymptotic_theory_and_numerical_simulations/links/557e835008aeb61eae248274/Vortex-rings-in-a-viscous-fluid-Asymptotic-theory-and-numerical-simulations.pdf