The flow of classical mechanical cubic potential systems
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Department of Mathematics, Facultad de Ciencias, UNAM, Ciudad Universitaria, México, D.F. 04510
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Department of Mathematics, UAM-I, P.O.Box 55-534, México, D.F. 09340, MEX
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Department of Mathematics, Universidade Federal de Pernambuco, Cidade Universitaria, Recife-Pe