@article{10_1017_S0017089509004984,
     author = {BUCKLEY, S. M. and FALK, K. and WRAITH, D. J.},
     title = {PTOLEMAIC {SPACES} {AND} {CAT(0)}},
     journal = {Glasgow mathematical journal},
     pages = {301--314},
     year = {2009},
     volume = {51},
     number = {2},
     doi = {10.1017/S0017089509004984},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089509004984/}
}