@article{GDZPPN002439905,
title = {Strong positivity in C (...) for elliptic systems.},
journal = {Mathematische Zeitschrift},
volume = {209},
year = {1992},
pages = {251-272},
zbl = {0727.35045},
url = {http://dml.mathdoc.fr/item/GDZPPN002439905}
}
Sweers, Guido. Strong positivity in C (...) for elliptic systems.. Mathematische Zeitschrift, Tome 209 (1992) pp. 251-272. http://gdmltest.u-ga.fr/item/GDZPPN002439905/