@article{GMJ_2001__8_4_50084,
     author = {Bartu\v{s}ek, M. and Osi\v{c}ka, J.},
     title = {On the existence of singular solutions.},
     journal = {Georgian Mathematical Journal},
     pages = {669--681},
     publisher = {mathdoc},
     volume = {8},
     number = {4},
     year = {2001},
     zbl = {1014.34026},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_2001__8_4_50084/}
}