@article{VMUMM_1982_5_a8,
     author = {A. A. Belyaev},
     title = {The mean value theorem for harmonic functions in a domain of {Hilbert} space},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {32--35},
     year = {1982},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1982_5_a8/}
}