@article{ISU_2013_13_1_a3,
     author = {N. V. Baidakova},
     title = {New {Estimates} of the {Error} of {Approximation} of {Derivatives} under {Interpolation} of a {Function} on a {Triangle} by {Polynomials} of the {Third} {Degree}},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {15--19},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2013_13_1_a3/}
}