D. St. P. RichardsDepartment of Statistics,Pennsylvania State University.
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Acknowledgements:
With deep gratitude to Ingram Olkin for advice and supportregarding the final version of this material.
Notes:
The main references used in writing this chapter areHerz (1955),James (1964),Muirhead (1982),Gross and Richards (1987), andRichards (1992). For additional bibliographic reading seeVilenkin and Klimyk (1992) andFaraut and Korányi (1994).