@article{TIMM_2012_18_4_a0,
     author = {R. R. Akopyan},
     title = {Best approximation for the analytic continuation operator on the class of analytic functions in a~ring},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {3--13},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2012_18_4_a0/}
}