@article{10_4153_CMB_1970_003_0,
     author = {Jonsson, W.},
     title = {On a {Result} of {A.} {M.} {Macbeath} on {Normal} {Subgroups} of a {Fuchsian} {Group}},
     journal = {Canadian mathematical bulletin},
     pages = {15--16},
     year = {1970},
     volume = {13},
     number = {1},
     doi = {10.4153/CMB-1970-003-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1970-003-0/}
}