@article{10_4153_CMB_1991_045_8,
     author = {Xie, T. F. and Zhou, S. P.},
     title = {A {Remark} on a {Paper} of {Walter} and {Zayed}},
     journal = {Canadian mathematical bulletin},
     pages = {281--285},
     year = {1991},
     volume = {34},
     number = {2},
     doi = {10.4153/CMB-1991-045-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-045-8/}
}