@article{MZ_1986__191_173656,
     author = {Arne Jensen},
     title = {Commutator {Methods} and a {Smoothing} {Property} of the {Schr\"odinger} {Evolution} {Group.}},
     journal = {Mathematische Zeitschrift},
     pages = {53--60},
     publisher = {mathdoc},
     volume = {191},
     year = {1986},
     zbl = {0594.35032},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__191_173656/}
}