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Phys. Fluids 30 , 3369-3382.
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of three-dimensional stratified flow, Phys. Rev. Lett. 52 [1984], 2552-2555.
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Math. Phys. 32 , 137-151.
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and control of x<^2 l processes and the generalized Poincare sphere, preprint.
Alber, M.S., G .G. Luther, J.E. Marsden and J.W. Robbins [1998b], Geomet-
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interaction, preprint.
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