@article{CMUC_2004__45_3_a6,
     author = {Leonardi, S.},
     title = {A maximum principle for linear elliptic systems with discontinuous coefficients},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {457--474},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {2004},
     mrnumber = {2103140},
     zbl = {1098.35044},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2004__45_3_a6/}
}