@article{10_21136_CPM_1981_118101,
     author = {\v{C}ern\'y, Ilja},
     title = {A note on the local structure of levels of a plane vector field},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {279--289},
     year = {1981},
     volume = {106},
     number = {3},
     doi = {10.21136/CPM.1981.118101},
     mrnumber = {629726},
     zbl = {0486.31002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1981.118101/}
}