@article{ISU_2007_7_2_a8,
     author = {A. V. Fryantsev},
     title = {On numerical approximation of differential polynomials},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {39--43},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2007_7_2_a8/}
}