@article{10_4153_CMB_1967_078_8,
     author = {Dunham, C.},
     title = {Necessity of {Alteration}},
     journal = {Canadian mathematical bulletin},
     pages = {743--744},
     year = {1967},
     volume = {10},
     number = {5},
     doi = {10.4153/CMB-1967-078-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-078-8/}
}