@inproceedings{KP84, author = {E. Kranakis and I.C.C. Phillips}, title = {Partitions and Homogeneous Sets for Admissible Ordinals}, booktitle = {Models and Sets, Proceedings of the Logic Colloquium held in Aachen, July 18-23, 1983, Part I}, editor = {G.H. M\"{u}ller and M.M. Richter}, series = {Lecture Notes in Mathematics}, publisher = {Springer-Verlag}, volume = 1103, pages = {235-260}, year = 1984 }