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\bibitem{Ludu2008} {\textquotedblleft}\textit{Fiber bundle description of flow and nonlinear hydrodynamics on circles}{\textquotedblright}. Ludu A, Journal of nonlinear mathematical physics \textbf{15}, 157 (2008).   http://doi.org/10.2991/jnmp.2008.15.s2.11

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