@article{MABA_1988_2_2_a13,
     author = {N. N. Pavlov. V. V. Vershinin},
     title = {On the {Stable} {Approximation} of {Derivatives} by {Splines} in the {Convex} {Set}},
     journal = {Mathematica balkanica},
     pages = {222},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1988},
     url = {http://geodesic.mathdoc.fr/item/MABA_1988_2_2_a13/}
}