@article{ADM_2008_4_a4,
     author = {James Howie and Gerald Williams},
     title = {The {Tits} alternative for generalized triangle groups of type~$(3,4,2)$},
     journal = {Algebra and discrete mathematics},
     pages = {40--48},
     publisher = {mathdoc},
     number = {4},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2008_4_a4/}
}