1. The plus-construction and fibrations;Berrick;Quart. J. Math. Oxford (2),1982
2. Group epimorphisms preserving perfect radicals, and the plus-construction;Berrick,1984
3. A universal space for plus-constructions;Berrick;Topology,1999
4. Fibrations and nullifications;Berrick;Israel J. Math.,2003
5. A push-out construction for groups with operators;Bokor;Expo. Math.,1999