TY  - JOUR
AU  - Dunham, C.
TI  - Necessity of Alteration
JO  - Canadian mathematical bulletin
PY  - 1967
SP  - 743
EP  - 744
VL  - 10
IS  - 5
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-078-8/
DO  - 10.4153/CMB-1967-078-8
ID  - 10_4153_CMB_1967_078_8
ER  -