%0 Journal Article %A W. Bertram %A J. Hilgert %T Characterization of the Kantor-Koecher-Tits Algebra by a Generalized Ahlfors Operator %J Journal of Lie Theory %D 2001 %P 415-426 %V 11 %N 2 %U http://geodesic.mathdoc.fr/item/JOLT_2001_11_2_a6/ %F JOLT_2001_11_2_a6