@article{GDZPPN002391465, title = {E-Function Series whose Sums are Constants.}, journal = {Mathematische Zeitschrift}, volume = {78}, year = {1962}, pages = {231-234}, zbl = {0103.29701}, url = {http://dml.mathdoc.fr/item/GDZPPN002391465} }
Ragab, F.M.; MacRobert, T.M. E-Function Series whose Sums are Constants.. Mathematische Zeitschrift, Tome 78 (1962) pp. 231-234. http://gdmltest.u-ga.fr/item/GDZPPN002391465/