@article{10_4153_CMB_1972_092_4,
     author = {Hartmann, F. W.},
     title = {Summability {Tests} for {Singular} {Points}},
     journal = {Canadian mathematical bulletin},
     pages = {525--528},
     year = {1972},
     volume = {15},
     number = {4},
     doi = {10.4153/CMB-1972-092-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-092-4/}
}