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The role of the unstable equilibrium points in the transfer of matter in galactic potentials
M. Romero-Gómez, J.J. Masdemont, C. García-Gómez and E. Athanassoula Communications in Nonlinear Science and Numerical Simulation 14(12) 4123 (2009) https://doi.org/10.1016/j.cnsns.2008.07.013
Rings and spirals in barred galaxies - I. Building blocks