@article{10_21136_CMJ_1995_128513,
     author = {John, Kamil},
     title = {On a result of {J.} {Johnson}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {235--240},
     publisher = {mathdoc},
     volume = {45},
     number = {2},
     year = {1995},
     doi = {10.21136/CMJ.1995.128513},
     mrnumber = {1331461},
     zbl = {0869.46011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1995.128513/}
}