1. On a problem of Lyndon;Baumslag;J. London Math. Soc.,1960
2. On generalised free products;Baumslag;Math. Z.,1952
3. Some aspects of groups with unique roots;Baumslag;Acta Math.,1960
4. Some remarks on nilpotent groups with roots;Baumslag,1961
5. Residual properties of infinite soluble groups;Gruenberg,1957