%0 Journal Article %A Levene, R. H. %T A Double Triangle Operator Algebra From SL 2(R+) %J Canadian mathematical bulletin %D 2006 %P 117-126 %V 49 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-2006-012-3/ %R 10.4153/CMB-2006-012-3 %F 10_4153_CMB_2006_012_3