@article{GDZPPN002347393,
title = {Unbounded Soboleff Regions.},
journal = {Mathematica Scandinavica},
volume = {13},
year = {1963},
pages = {75-89},
zbl = {0131.32604},
url = {http://dml.mathdoc.fr/item/GDZPPN002347393}
}
Andersson, Rolf. Unbounded Soboleff Regions.. Mathematica Scandinavica, Tome 13 (1963) pp. 75-89. http://gdmltest.u-ga.fr/item/GDZPPN002347393/