Je1986
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A. Jensen. Commutator methods and a smoothing property of the Schrödinger evolution group. Math. Z, 191 (1986), 53-59. MathSciNet, arXiv.
A. Jensen. Commutator methods and a smoothing property of the Schrödinger evolution group. Math. Z, 191 (1986), 53-59. MathSciNet, arXiv.