Modelling of optimal vortex ring formation using the Stokes approximationKaplanski, Felix; Rudi, ÜloEUROMECH Fluid Mechanics Conference 6 : Stockholm, June 26-30, 20062006 / p. 110 https://www.researchgate.net/publication/278242829_Modeling_of_optimal_vortex_ring_formation_using_the_Stokes_approximation