@article{SJIM_2013_16_4_a5,
     author = {V. V. Karachik},
     title = {On solvability conditions for {a~Neumann} problem for a~polyharmonic equation in the unit ball},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {61--74},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2013_16_4_a5/}
}