References
C. S. Ballantine, Some Moebius Semigroups on the 2-Sphere,J. Math. Mech., 11 (1962), pp. 455–467.
Charles Loewner, On Some Transformation Semigroups,J. Rat. Mech. Anal. 5 (1956), pp. 791–804.
G. Pólya,Induction and Analogy in Mathematics, Princeton University Press, Princeton, 1954.
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Ballantine, C.S. A semigroup generated by definite matrices. J. Anal. Math. 12, 257–275 (1964). https://doi.org/10.1007/BF02807436
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DOI: https://doi.org/10.1007/BF02807436