Buckley, Stephen M. and Falk, K. (2013) Natural maps between CAT(0) boundaries. New York Journal of Mathematics, 19. pp. 13-22. ISSN 1076-9803
Buckley, Stephen M., Falk, K. and Wraith, David (2009) Ptolemaic spaces and CAT (0). Glasgow Mathematical Journal, 51. pp. 301-314. ISSN 0017-0895
Buckley, Stephen M. and Falk, K. (2011) Rough CAT(0) Spaces. Working Paper. (Preprint) Department of Mathematics, National University of Ireland Maynooth. (Unpublished)