1. Some generalizations of metric spaces;Ceder, Jack G.;Pacific J. Math.,1961
2. P. J. Collins, Talk given at ICM 82, Warsaw, August 1983.
3. \bysame, Letter to the author, September 1983.
4. P. J. Collins, G. M. Reed, A. W. Roscoe and M. E. Rudin, A lattice of conditions on topological spaces, preprint.
5. Criteria for metrisability;Collins, P. J.;Proc. Amer. Math. Soc.,1984