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On leave of absence from Faculdade de Ciências da Universidade de Lisboa, with a scholarship of Fundação Calouste Gulbenkian.
Work performed under the auspicies of G.N.A.F.A.-C.N.R. and supported by the fund M.P.I. 60%, ZAN 6Q4.
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Fernandes, L., Zanolin, F. Periodic solutions of a second order differential equation with one-sided growth restrictions on the restoring term. Arch. Math 51, 151–163 (1988). https://doi.org/10.1007/BF01206473
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DOI: https://doi.org/10.1007/BF01206473