@article{10_4153_CMB_1961_009_x,
     author = {Schwerdtfeger, Hans},
     title = {Notes on {Numerical} {Analysis} {III}},
     journal = {Canadian mathematical bulletin},
     pages = {53--55},
     year = {1961},
     volume = {4},
     number = {1},
     doi = {10.4153/CMB-1961-009-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-009-x/}
}