Periodic solutions to a non-linear differential equation of the order
- Volume: 83, Issue: 1, page 133-137
- ISSN: 1120-6330
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top- ANDRES, J. - VORÁČEK, J., 1984. Periodic solutions to a non-linear parametric differential equation of the third order. Atti Acc. Lincei Rend. fis. (8), 77: 81-86. Zbl0607.34039MR884940
- HARDY, G.H. - LITTLEWGOD, J.E. - PÓLYA, G., 1951. Inequalities. Cambridge Univ. Press, 185. Zbl0010.10703JFM60.0169.01