@article{CMA_2015_96_a7,
     author = {B. V. Simonov and V. A. Ivanyuk and I. E. Simonova},
     title = {Existence of best approximation elements in the spaces $L_{\varphi_+\varphi_-}$},
     journal = {Contemporary Mathematics and Its Applications},
     pages = {112--131},
     publisher = {mathdoc},
     volume = {96},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMA_2015_96_a7/}
}