%0 Journal Article %A Cuntz, Joachim %A Quillen, Daniel %T Algebra extensions and nonsingularity %J Journal of the American Mathematical Society %D 1995 %P 251-289 %V 08 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1995-1303029-0/ %R 10.1090/S0894-0347-1995-1303029-0 %F 10_1090_S0894_0347_1995_1303029_0