@article{1183506870,
author = {Beckenbach, E. F.},
title = {Concerning the definition of harmonic functions},
journal = {Bull. Amer. Math. Soc.},
volume = {51},
number = {11},
year = {1945},
pages = { 240-245},
language = {en},
url = {http://dml.mathdoc.fr/item/1183506870}
}
Beckenbach, E. F. Concerning the definition of harmonic functions. Bull. Amer. Math. Soc., Tome 51 (1945) no. 11, pp. 240-245. http://gdmltest.u-ga.fr/item/1183506870/