@article{CMUC_1987__28_2_a9,
     author = {Neumann, Jan},
     title = {An abstract differential inequality and eigenvalues of variational inequalities},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {277--293},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1987},
     mrnumber = {904753},
     zbl = {0636.35011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1987__28_2_a9/}
}