@article{10_1023_A_1022216119044,
     author = {Fe\v{c}kan, Michal and Koll\'ar, Richard},
     title = {Discontinuous wave equations and a topological degree for some classes of multi-valued mappings},
     journal = {Applications of Mathematics},
     pages = {15--32},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1999},
     doi = {10.1023/A:1022216119044},
     mrnumber = {1666854},
     zbl = {1060.35524},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1023/A:1022216119044/}
}