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@article{MZ_1965__90_170473, author = {Peter Lappan}, title = {Some results on harmonic normal functions.}, journal = {Mathematische Zeitschrift}, pages = {155--159}, publisher = {mathdoc}, volume = {90}, year = {1965}, zbl = {0163.14002}, url = {http://geodesic.mathdoc.fr/item/MZ_1965__90_170473/} }
Peter Lappan. Some results on harmonic normal functions.. Mathematische Zeitschrift, Tome 90 (1965), pp. 155-159. http://geodesic.mathdoc.fr/item/MZ_1965__90_170473/