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@article{MS2_1978__43_166602, author = {Andrzej Szulkin}, title = {An example concerning the topological character of the zero-set of a harmonic function.}, journal = {Mathematica Scandinavica}, pages = {60--62}, publisher = {mathdoc}, volume = {43}, year = {1978}, zbl = {0402.31007}, url = {http://geodesic.mathdoc.fr/item/MS2_1978__43_166602/} }
Andrzej Szulkin. An example concerning the topological character of the zero-set of a harmonic function.. Mathematica Scandinavica, Tome 43 (1978), pp. 60-62. http://geodesic.mathdoc.fr/item/MS2_1978__43_166602/