@article{MM2_1972__7_154102,
     author = {Rolf Trautner},
     title = {Hausdorff-Summability of {Power} {Series} {I.}},
     journal = {Manuscripta mathematica},
     pages = {1--12},
     publisher = {mathdoc},
     volume = {7},
     year = {1972},
     zbl = {0235.40008},
     url = {http://geodesic.mathdoc.fr/item/MM2_1972__7_154102/}
}