TY  - JOUR
AU  - Karnik, S. M.
AU  - Willard, S.
TI  - Natural Covers and R-Quotient Maps
JO  - Canadian mathematical bulletin
PY  - 1982
SP  - 456
EP  - 461
VL  - 25
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1982-065-1/
DO  - 10.4153/CMB-1982-065-1
ID  - 10_4153_CMB_1982_065_1
ER  -