@article{GDZPPN002334674,
title = {First order elliptic systems and the existence of homoclinic orbits in Hamiltonian systems.},
journal = {Mathematische Annalen},
volume = {287},
year = {1990},
pages = {483-504},
zbl = {0702.34039},
url = {http://dml.mathdoc.fr/item/GDZPPN002334674}
}
Hofer, H.; Wysocki, K. First order elliptic systems and the existence of homoclinic orbits in Hamiltonian systems.. Mathematische Annalen, Tome 287 (1990) pp. 483-504. http://gdmltest.u-ga.fr/item/GDZPPN002334674/