@article{10_4153_CMB_1965_066_6,
     author = {Edelstein, M.},
     title = {On a {Problem} by {R.A.} {Hirschfeld:} {Counterexample}},
     journal = {Canadian mathematical bulletin},
     pages = {835--835},
     year = {1965},
     volume = {8},
     number = {6},
     doi = {10.4153/CMB-1965-066-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1965-066-6/}
}