@article{10_4153_CJM_1966_099_0,
     author = {Shapiro, H. L.},
     title = {Extensions of {Pseudometrics}},
     journal = {Canadian journal of mathematics},
     pages = {981--998},
     year = {1966},
     volume = {18},
     number = {1},
     doi = {10.4153/CJM-1966-099-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-099-0/}
}