@article{ZNSL_1994_217_a9,
     author = {O. G. Parfenov},
     title = {The {Gelfand} and {Bernstein} $n$-widths of some classes of analytic functions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {112--129},
     publisher = {mathdoc},
     volume = {217},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1994_217_a9/}
}