@article{05555909, title = {Three-Hilbert-space formulation of quantum mechanics.}, journal = {SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]}, volume = {5}, year = {2009}, doi = {10.3842/SIGMA.2009.001}, zbl = {1160.81017}, language = {en}, url = {http://dml.mathdoc.fr/item/05555909} }
Znojil, Miloslav. Three-Hilbert-space formulation of quantum mechanics.. SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only], Tome 5 (2009) . doi : 10.3842/SIGMA.2009.001. http://gdmltest.u-ga.fr/item/05555909/