@article{MAN_1974__207_162539,
     author = {J. Loustaunau},
     title = {A {Characterization} of {Pt\`ak} {Spaces.}},
     journal = {Mathematische Annalen},
     pages = {177--180},
     publisher = {mathdoc},
     volume = {207},
     year = {1974},
     zbl = {0253.46003},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__207_162539/}
}