@article{MZM_1993_54_6_a7,
     author = {A. A. Solyanik},
     title = {Bordering functions for differential bases},
     journal = {Matemati\v{c}eskie zametki},
     pages = {82--89},
     publisher = {mathdoc},
     volume = {54},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_54_6_a7/}
}