TY  - JOUR
AU  - Xie, T. F.
AU  - Zhou, S. P.
TI  - A Remark on a Paper of Walter and Zayed
JO  - Canadian mathematical bulletin
PY  - 1991
SP  - 281
EP  - 285
VL  - 34
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-045-8/
DO  - 10.4153/CMB-1991-045-8
ID  - 10_4153_CMB_1991_045_8
ER  -