TY  - JOUR
AU  - Brown, B.
TI  - An Approximation to {X, Y}
JO  - Canadian mathematical bulletin
PY  - 1969
SP  - 133
EP  - 137
VL  - 12
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-012-7/
DO  - 10.4153/CMB-1969-012-7
ID  - 10_4153_CMB_1969_012_7
ER  -