%0 Journal Article %A Digernes, Trond %A Halpern, Herbert %T On Open Projections of GCR Algebras %J Canadian journal of mathematics %D 1972 %P 978-982 %V 24 %N 5 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-098-6/ %R 10.4153/CJM-1972-098-6 %F 10_4153_CJM_1972_098_6