@article{ZNSL_2016_447_a8,
     author = {N. A. Shirokov},
     title = {Smoothness of a holomorphic function in a ball and smoothness of its modulus on the sphere},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {123--128},
     publisher = {mathdoc},
     volume = {447},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2016_447_a8/}
}