TY - JOUR AU - Hartmann, F. W. TI - Summability Tests for Singular Points JO - Canadian mathematical bulletin PY - 1972 SP - 525 EP - 528 VL - 15 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-092-4/ DO - 10.4153/CMB-1972-092-4 ID - 10_4153_CMB_1972_092_4 ER -