@article{ZNSL_2017_456_a11,
     author = {M. Ya. Mazalov},
     title = {On the existence of angular boundary values for polyharmonic functions in the unit ball},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {144--154},
     publisher = {mathdoc},
     volume = {456},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2017_456_a11/}
}