@article{PORMA_1973__32_2_115191,
     author = {Carstens, Allan M.},
     title = {The lattice of pseudotopologies on {S}},
     journal = {Portugaliae mathematica},
     pages = {71--73},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1973},
     mrnumber = {0322771},
     zbl = {0255.54001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1973__32_2_115191/}
}