@article{CMUC_2008_49_2_a12,
     author = {Smith, Jonathan D. H.},
     title = {Ternary quasigroups and the modular group},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {309--317},
     year = {2008},
     volume = {49},
     number = {2},
     mrnumber = {2426895},
     zbl = {1192.20064},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2008_49_2_a12/}
}