@article{10_1017_S0017089500002846,
     author = {Jr, S. H. Cox},
     title = {The purity of a completion},
     journal = {Glasgow mathematical journal},
     pages = {127--129},
     year = {1976},
     volume = {17},
     number = {2},
     doi = {10.1017/S0017089500002846},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002846/}
}