@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/