@article{MM2_1978__24_154543,
     author = {Mariano Giaquinta},
     title = {A {Counter-Example} to the {Boundary} {Regularity} of {Solutions} to {Elliptic} {Quasilinear} {Systems.}},
     journal = {Manuscripta mathematica},
     pages = {217--220},
     publisher = {mathdoc},
     volume = {24},
     year = {1978},
     zbl = {0373.35027},
     url = {http://geodesic.mathdoc.fr/item/MM2_1978__24_154543/}
}