a1 School of Mathematical Sciences, University of Adelaide, SA 5005, Australia (email: penny@sanchez.id.au)
(Received March 28 2010)
2000 Mathematics subject classification
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Footnotes
Thesis submitted to The University of Adelaide, June 2009. Degree approved, February 2010. Supervisors: Associate Professor A. V. Metcalfe and Associate Professor G. V. Glonek.