@article{MM2_1977__22_154502,
     author = {Rudolf -E. Hoffmann},
     title = {Irreducible {Filters} and {Sober} {Spaces.}},
     journal = {Manuscripta mathematica},
     pages = {365--380},
     publisher = {mathdoc},
     volume = {22},
     year = {1977},
     zbl = {0356.54008},
     url = {http://geodesic.mathdoc.fr/item/MM2_1977__22_154502/}
}