@article{MAN_1971__193_182716,
     author = {Douglas HARRIS},
     title = {Katetov {Extension} as a {Functor.}},
     journal = {Mathematische Annalen},
     pages = {171--175},
     publisher = {mathdoc},
     volume = {193},
     year = {1971},
     zbl = {0205.26603},
     url = {http://geodesic.mathdoc.fr/item/MAN_1971__193_182716/}
}