@article{CMFD_2007_25_a10,
     author = {K. I. Oskolkov},
     title = {Linear and {Nonlinear} {Methods} of {Relief} {Approximation}},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {126--148},
     publisher = {mathdoc},
     volume = {25},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2007_25_a10/}
}