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Original Russian Text © R.P. Agarwal, D. O’Regan, N.S. Papageorgiou, 2007, published in Differentsial’nye Uravneniya, 2007, Vol. 43, No. 2, pp. 154–160.
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Agarwal, R.P., O’Regan, D. & Papageorgiou, N.S. On the existence of two nontrivial solutions of periodic problems with operators of p-Laplacian type. Diff Equat 43, 157–163 (2007). https://doi.org/10.1134/S0012266107020036
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DOI: https://doi.org/10.1134/S0012266107020036