@article{CM_1977__34_1_109_0,
     author = {Hajek, Darrell W.},
     title = {Categories of {Wallman} extendible functions},
     journal = {Compositio Mathematica},
     pages = {109--111},
     publisher = {Noordhoff International Publishing},
     volume = {34},
     number = {1},
     year = {1977},
     mrnumber = {448296},
     zbl = {0383.54016},
     language = {en},
     url = {http://www.numdam.org/item/CM_1977__34_1_109_0/}
}