@article{1183492256, author = {Walsh, J. L.}, title = {On the degree of approximation to a harmonic function}, journal = {Bull. Amer. Math. Soc.}, volume = {33}, number = {6}, year = {1927}, pages = { 591-598}, language = {en}, url = {http://dml.mathdoc.fr/item/1183492256} }
Walsh, J. L. On the degree of approximation to a harmonic function. Bull. Amer. Math. Soc., Tome 33 (1927) no. 6, pp. 591-598. http://gdmltest.u-ga.fr/item/1183492256/