@article{ZNSL_1996_232_a10,
     author = {O. G. Parfenov},
     title = {The {Gelfand} and {Bernstein} widths of some classes of analytic {functions.~II}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {134--140},
     year = {1996},
     volume = {232},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1996_232_a10/}
}