@article{702378,
title = {The Dirichlet problem for sublaplacians on nilpotent Lie groups - geometric criteria for regularity},
booktitle = {Equadiff 7},
series = {GDML\_Books},
publisher = {BSB B.G. Teubner Verlagsgesellschaft},
address = {Leipzig},
year = {1990},
pages = {171-174},
zbl = {0725.31004},
url = {http://dml.mathdoc.fr/item/702378}
}
Hansen, W.; Hueber, H. The Dirichlet problem for sublaplacians on nilpotent Lie groups - geometric criteria for regularity, dans Equadiff 7, GDML_Books, (1990), pp. 171-174. http://gdmltest.u-ga.fr/item/702378/