@article{MZ_1978__163_172755,
     author = {Charles A. Stuart},
     title = {Maximal and {Minimal} {Solutions} of {Elliptic} {Differential} {Equations} with {Discontinuous} {Non-Linearities.}},
     journal = {Mathematische Zeitschrift},
     pages = {239--250},
     publisher = {mathdoc},
     volume = {163},
     year = {1978},
     zbl = {0403.35036},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__163_172755/}
}