%0 Journal Article %A Peter J. Olver %A Juha Pohjanpelto %A Francis Valiquette %T On the Structure of Lie Pseudo-Groups %J Symmetry, integrability and geometry: methods and applications %D 2009 %V 5 %U http://geodesic.mathdoc.fr/item/SIGMA_2009_5_a76/ %G en %F SIGMA_2009_5_a76