@article{GDZPPN002223384,
title = {A Counterexample in Elliptic Regularity Theory.},
journal = {Manuscripta mathematica},
volume = {35},
year = {1981},
pages = {85-92},
zbl = {0468.35027},
url = {http://dml.mathdoc.fr/item/GDZPPN002223384}
}
Struwe, Michael. A Counterexample in Elliptic Regularity Theory.. Manuscripta mathematica, Tome 35 (1981) pp. 85-92. http://gdmltest.u-ga.fr/item/GDZPPN002223384/