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KRAWCEWICZ, Wiesław, LV, Yanli and XIAO, Huafeng. Multiple solutions with prescribed minimal period for second order odd Newtonian systems with symmetries. Topological Methods in Nonlinear Analysis. Online. 1 June 2016. Vol. 47, no. 2, pp. 659 - 679. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2016.024.