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This paper is part of the author's doctoral dissertation (The Pennsylvania State University, 1965). The author is most grateful to his advisor, ProfessorW. A. Howard, and to ProfessorH. Levitz for many helpful suggestions.
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Gerber, H. An extension of Schütte's Klammersymbols. Math. Ann. 174, 203–216 (1967). https://doi.org/10.1007/BF01360719
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DOI: https://doi.org/10.1007/BF01360719