@article{GDZPPN002323230,
title = {Breaking of Symmetries for Forced Equations.},
journal = {Mathematische Annalen},
volume = {264},
year = {1983},
pages = {473-486},
zbl = {0491.58012},
url = {http://dml.mathdoc.fr/item/GDZPPN002323230}
}
Dancer, E.N. Breaking of Symmetries for Forced Equations.. Mathematische Annalen, Tome 264 (1983) pp. 473-486. http://gdmltest.u-ga.fr/item/GDZPPN002323230/