%0 Journal Article %A Stjepan Meljanac %A Rina Štrajn %T Exponential Formulas, Normal Ordering and the Weyl–Heisenberg Algebra %J Symmetry, integrability and geometry: methods and applications %D 2021 %V 17 %U http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a83/ %G en %F SIGMA_2021_17_a83