1. Spiegel, E. A. 1980 Fluid dynamical form of the linear and nonlinear Schrödinger equations.Physica D 1,236–240.
2. Leibovich, S. & Ma, H. Y. 1983 Soliton propagation on vortex cores and the Hasimoto soliton.Phys. Fluids 26,3173–3179.
3. Kida, S. 1981 A vortex filament moving without change of form.J. Fluid Mech. 112,397–409.
4. Hopfinger, E. J. & Browand, F. K. 1982 Vortex solitary waves in a rotating, turbulent flow.Nature 295,393–395.
5. Golden, J. H. & Purcell, D. 1978 Life cycle of the Union City, Oklahoma tornado and comparison with waterspouts.Mon. Weather Rev. 106,3–11.