@article{10_4153_CMB_1973_050_x,
     author = {Halter-Koch, Franz},
     title = {Letter to the {Editor}},
     journal = {Canadian mathematical bulletin},
     pages = {299--299},
     year = {1973},
     volume = {16},
     number = {3},
     doi = {10.4153/CMB-1973-050-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1973-050-x/}
}