@article{SM_1999_190_10_a1,
     author = {V. P. Mikhailov},
     title = {Existence of boundary values for metaharmonic functions},
     journal = {Sbornik. Mathematics},
     pages = {1417--1448},
     publisher = {mathdoc},
     volume = {190},
     number = {10},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1999_190_10_a1/}
}