@article{CMH_1978__53_139747,
     author = {P. Erd\"os and R.R. Hall},
     title = {Some new results in probalistic group theory.},
     journal = {Commentarii mathematici Helvetici},
     pages = {448--457},
     publisher = {mathdoc},
     volume = {53},
     year = {1978},
     zbl = {0385.20045},
     url = {http://geodesic.mathdoc.fr/item/CMH_1978__53_139747/}
}