@article{CMH_1983__58_139929,
     author = {Dusa McDuff and Pierre De La Harpe},
     title = {Acyclic groups of automorphisms.},
     journal = {Commentarii mathematici Helvetici},
     pages = {48--71},
     publisher = {mathdoc},
     volume = {58},
     year = {1983},
     zbl = {0522.20034},
     url = {http://geodesic.mathdoc.fr/item/CMH_1983__58_139929/}
}