MathSciNet bibliographic data MR1636887 34C05 (58F21) Fronville, Alexandra; Sadovski, Anton P.; Żołądek, Henryk Solution of the \$1\colon\!-2\$$1\colon\!-2$ resonant center problem in the quadratic case. Dedicated to the memory of Wiesław Szlenk. Fund. Math. 157 (1998), no. 2-3, 191–207. Journal

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