@article{GDZPPN00231939X,
title = {Perturbation of Harmonie Spaces.},
journal = {Mathematische Annalen},
volume = {250},
year = {1980},
pages = {111-122},
zbl = {0421.31009},
url = {http://dml.mathdoc.fr/item/GDZPPN00231939X}
}
Hansen, W. Perturbation of Harmonie Spaces.. Mathematische Annalen, Tome 250 (1980) pp. 111-122. http://gdmltest.u-ga.fr/item/GDZPPN00231939X/