@article{RSMUP_1997__97__193_0,
author = {Matzeu, M. and Girardi, M.},
title = {On periodic solutions of a class of second order nonautonomous systems with nonhomogeneous potentials indefinite in sign},
journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
volume = {98},
year = {1997},
pages = {193-210},
mrnumber = {1476171},
zbl = {0891.34050},
language = {en},
url = {http://dml.mathdoc.fr/item/RSMUP_1997__97__193_0}
}
Matzeu, M.; Girardi, M. On periodic solutions of a class of second order nonautonomous systems with nonhomogeneous potentials indefinite in sign. Rendiconti del Seminario Matematico della Università di Padova, Tome 98 (1997) pp. 193-210. http://gdmltest.u-ga.fr/item/RSMUP_1997__97__193_0/
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