@article{CMUC_1989__30_3_a4,
     author = {Dr\'abek, Pavel and Tomiczek, Petr},
     title = {Remark on the structure of the range of second order nonlinear elliptic operator},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {455--464},
     publisher = {mathdoc},
     volume = {30},
     number = {3},
     year = {1989},
     mrnumber = {1031863},
     zbl = {0702.35090},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_3_a4/}
}