@article{MM2_1981__34_154765,
     author = {Michael Struwe},
     title = {A {Counterexample} in {Elliptic} {Regularity} {Theory.}},
     journal = {Manuscripta mathematica},
     pages = {85--92},
     year = {1981},
     volume = {34},
     zbl = {0468.35027},
     url = {http://geodesic.mathdoc.fr/item/MM2_1981__34_154765/}
}