TY  - JOUR
AU  - Warren, Richard H.
TI  - Discrete Sets and Discrete Maps
JO  - Canadian mathematical bulletin
PY  - 1982
SP  - 242
EP  - 244
VL  - 25
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1982-035-2/
DO  - 10.4153/CMB-1982-035-2
ID  - 10_4153_CMB_1982_035_2
ER  -