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The center problem for a 1 : -4 resonant quadratic system
(Academic Press/ElsevierSan Diego, 2014-12-15)
The main objective of this paper is to find necessary and sufficient conditions for a 1 : −4 resonant system of the form 'X PONTO' = x − 'A IND.10' 'X POT.2' − 'A IND.01' xy − 'A IND.12' 'Y POT.2', 'Y PONTO' = −4y + 'B ...