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@article{DAN_1974_218_2_a12, author = {\`E. M. Saak}, title = {The saltus problem for harmonic functions in $n$ variables}, journal = {Doklady Akademii Nauk}, pages = {298--300}, publisher = {mathdoc}, volume = {218}, number = {2}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1974_218_2_a12/} }
È. M. Saak. The saltus problem for harmonic functions in $n$ variables. Doklady Akademii Nauk, Tome 218 (1974) no. 2, pp. 298-300. http://geodesic.mathdoc.fr/item/DAN_1974_218_2_a12/