@article{MAN_1973__201_162393,
     author = {S. Koppelberg},
     title = {Some {Classes} of {Projective} {Boolean} {Algebras.}},
     journal = {Mathematische Annalen},
     pages = {283--300},
     publisher = {mathdoc},
     volume = {201},
     year = {1973},
     zbl = {0258.06010},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__201_162393/}
}