%0 Journal Article %A Riečan, Beloslav %T Representation of observables in quantum mechanical models %J Mathematica slovaca %D 1994 %P -129 %V 44 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1994__44_2_a1/ %G en %F MASLO_1994__44_2_a1