@article{10_4153_CJM_1984_047_2,
     author = {Ogg, A. P.},
     title = {Some {Special} {Classes} of {Cartan} {Matrices}},
     journal = {Canadian journal of mathematics},
     pages = {800--819},
     year = {1984},
     volume = {36},
     number = {5},
     doi = {10.4153/CJM-1984-047-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1984-047-2/}
}