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tokens: This work is part of the research project entitled ‘Dynamical Analysis, Advanced Orbit Propagation and Simulation of Complex Space Systems’ (ESP2013-41634-P) supported by the Spanish Ministry of Economy and Competitiveness. The author has been funded by a ‘La Caixa’ Doctoral Fellowship for he is deeply grateful to Obra Social ‘La Caixa’. The present paper would not have been possible without the selfless help, support, and advice from Prof. Jesús Peláez. An anonymous reviewer made valuable contributions to the final version of the manuscript.