Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy. School of Mathematics and Statistics, College of Science and Engineering, University of Glasgow, 2018.
Thesis
Ph.D. University of Glasgow 2018 School of Mathematics and Statistics, Mathematics.
Bibliography
Includes bibliographical references (pages 155-[163]).
Note
Electronic version also available via Enlighten : Theses http://theses.gla.ac.uk/30738/