@article{1256053436, author = {Ahern, P. R.}, title = {Approximation to harmonic functions}, journal = {Illinois J. Math.}, volume = {13}, number = {4}, year = {1969}, pages = { 757-760}, language = {en}, url = {http://dml.mathdoc.fr/item/1256053436} }
Ahern, P. R. Approximation to harmonic functions. Illinois J. Math., Tome 13 (1969) no. 4, pp. 757-760. http://gdmltest.u-ga.fr/item/1256053436/