%0 Journal Article %A Dieter Schuch %T Riccati and Ermakov Equations in Time-Dependent and Time-Independent Quantum Systems %J Symmetry, integrability and geometry: methods and applications %D 2008 %V 4 %U http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a42/ %G en %F SIGMA_2008_4_a42