@article{MT_2013_16_2_a4,
     author = {V. V. Karachik},
     title = {On the mean value property for polyharmonic functions in the ball},
     journal = {Matemati\v{c}eskie trudy},
     pages = {69--88},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2013_16_2_a4/}
}