@article{GDZPPN002317346, title = {Harnack Sets and Openness of Harmonie Morphisms.}, journal = {Mathematische Annalen}, volume = {243}, year = {1979}, pages = {181-186}, zbl = {0401.31004}, url = {http://dml.mathdoc.fr/item/GDZPPN002317346} }
Fuglede, Bent. Harnack Sets and Openness of Harmonie Morphisms.. Mathematische Annalen, Tome 243 (1979) pp. 181-186. http://gdmltest.u-ga.fr/item/GDZPPN002317346/