Pairs of positive periodic solutions of second order nonlinear equations with indefinite weight

Journal of Differential Equations - Tập 252 - Trang 2900-2921 - 2012
Alberto Boscaggin1, Fabio Zanolin2
1SISSA/ISAS – International School for Advanced Studies, via Bonomea, 265,34136 Trieste, Italy
2University of Udine, Department of Mathematics and Computer Science, via delle Scienze 206, 33100 Udine, Italy

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