A thesis submitted in fulfilment of the requirement for the Degree of Doctor of Philosophy, School of Mathematics and Statistics, College of Science and Engineering, University of Glasgow, September 2017.
Thesis
Ph.D. University of Glasgow 2017 School of Mathematics and Statistics.
Bibliography
Includes bibliographical references (pages 155-175).
Note
Electronic version also available via Enlighten : Theses http://theses.gla.ac.uk/8415/