@article{CM_1970__22_4_383_0,
     author = {Bryant, V. W.},
     title = {The convexity of the subset space of a metric space},
     journal = {Compositio Mathematica},
     pages = {383--385},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {22},
     number = {4},
     year = {1970},
     mrnumber = {275293},
     zbl = {0205.27102},
     language = {en},
     url = {http://www.numdam.org/item/CM_1970__22_4_383_0/}
}