@article{10_4153_CMB_1970_090_9,
     author = {Milnes, Paul},
     title = {Counterexample to a {Conjecture} of {Greenleaf}},
     journal = {Canadian mathematical bulletin},
     pages = {497--499},
     year = {1970},
     volume = {13},
     number = {4},
     doi = {10.4153/CMB-1970-090-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1970-090-9/}
}