@article{PORMA_1954__13_3_114735,
     author = {Bartholomay, A.F.},
     title = {Type-invariance and h-retraction},
     journal = {Portugaliae mathematica},
     pages = {105--110},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1954},
     mrnumber = {0097048},
     zbl = {0058.38804},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1954__13_3_114735/}
}