@article{IZKAB_2014_3_a6,
     author = {P. E. Marchenko},
     title = {On differentiated estimations of the natural
},
     journal = {News of the Kabardin-Balkar scientific center of RAS},
     pages = {60--66},
     publisher = {mathdoc},
     number = {3},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IZKAB_2014_3_a6/}
}