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2. Analytic and entire vectors for representations of Lie groups;Goodman;Trans. Amer. Math. Soc.,1969
3. Differential Geometry and Symmetric Spaces;Helgason,1962
4. Eine Bemerkung zu einem “Letter” von L. O'Raifeartaigh und einer Entgegnung von M. Flato und D. Sternheimer;Jost;Helv. Phys. Acta,1966
5. An Introduction to Harmonic Analysis;Katznelson,1968