TY  - JOUR
AU  - Edelstein, M.
TI  - On a Problem by R.A. Hirschfeld: Counterexample
JO  - Canadian mathematical bulletin
PY  - 1965
SP  - 835
EP  - 835
VL  - 8
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1965-066-6/
DO  - 10.4153/CMB-1965-066-6
ID  - 10_4153_CMB_1965_066_6
ER  -