@article{TIMM_2010_16_5_a18,
     author = {I. M. Prudnikov},
     title = {$C^2(D)$-integral approximation of nonsmooth functions conserving $\varepsilon(D)$-extremum points},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {159--169},
     publisher = {mathdoc},
     volume = {16},
     number = {5},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2010_16_5_a18/}
}