%0 Journal Article %A Hartmann, F. W. %T Summability Tests for Singular Points %J Canadian mathematical bulletin %D 1972 %P 525-528 %V 15 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-092-4/ %R 10.4153/CMB-1972-092-4 %F 10_4153_CMB_1972_092_4