1. Aczél J.: Lectures on Functional Equations and Their Applications. Academic Press, New York (1966)
2. Ebanks B., Stetkær H.: Continuous cocycles on locally compact groups. Aequationes Math. 78, 123–145 (2009)
3. Varadarajan V.S.: Geometry of Quantum Theory, 2nd edn. Springer, New York (1985)
4. Varadarajan V.S.: Lie Groups, Lie Algebras, and Their Representations. Prentice-Hall, Englewood Cliffs (1974)