1. C0-groups, commutator methods and spectral theory of N-body Hamiltonians;Amrein,1996
2. Characterization of pseudodifferential operators and applications;Beals;Duke Math. J.,1977
3. Smooth vectors and Weyl–Pedersen calculus for representations of nilpotent Lie groups;Beltiţă;Ann. Univ. Buchar. Math. Ser.,2010
4. The Technique of Pseudodifferential Operators;Cordes,1995