%0 Journal Article %A Henrik Aratyn %A Johan van de Leur %T Clifford Algebra Derivations of Tau-Functions for Two-Dimensional Integrable Models with Positive and Negative Flows %J Symmetry, integrability and geometry: methods and applications %D 2007 %V 3 %U http://geodesic.mathdoc.fr/item/SIGMA_2007_3_a19/ %G en %F SIGMA_2007_3_a19