@article{10_21136_CPM_1990_118402,
     author = {Kurek, Jan},
     title = {On natural operators on sectorform fields},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {232--239},
     publisher = {mathdoc},
     volume = {115},
     number = {3},
     year = {1990},
     doi = {10.21136/CPM.1990.118402},
     mrnumber = {1071055},
     zbl = {0706.58003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1990.118402/}
}