@article{10_4064_cm_25_2_191_200,
     author = {S. G\"ornemann},
     title = {A problem of {Halmos} on projective {Boolean} algebras},
     journal = {Colloquium Mathematicum},
     pages = {191--200},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {1972},
     doi = {10.4064/cm-25-2-191-200},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-25-2-191-200/}
}