%0 Journal Article %A Miloslav Znojil %T Three-Hilbert-Space Formulation of Quantum Mechanics %J Symmetry, integrability and geometry: methods and applications %D 2009 %V 5 %U http://geodesic.mathdoc.fr/item/SIGMA_2009_5_a0/ %G en %F SIGMA_2009_5_a0