@article{MZ_1969__109_171139,
     author = {Neil S. Trudinger},
     title = {Lipschitz {Continuous} {Solutions} of {Elliptic} {Equations} of the {Form} {...(Du)D{\texttwosuperior}u} = 0.},
     journal = {Mathematische Zeitschrift},
     pages = {211--216},
     publisher = {mathdoc},
     volume = {109},
     year = {1969},
     zbl = {0174.15801},
     url = {http://geodesic.mathdoc.fr/item/MZ_1969__109_171139/}
}