@article{10_4064_cm_44_1_97_98,
     author = {Grzegorz {\L}ubczonok},
     title = {On gradient fields},
     journal = {Colloquium Mathematicum},
     pages = {97--98},
     year = {1981},
     volume = {44},
     number = {1},
     doi = {10.4064/cm-44-1-97-98},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-44-1-97-98/}
}