I hereby declare that this submission is my own work and that, to the best of my knowledge and belief, it contains no material previously published or written by another person nor material which to a substantial extent has been accepted for the award of any other higher degree or diploma of the university or other institute of higher learning, except where due acknowledgment is made in the text." Bronwyn Lee Duffy CERTIFICATE OF ORIGINALITY I hereby declare that this submission is my own work

more »

... nd that, to the best of my knowledge and belief, it contains no material previously published or written by another person nor material which to a substantial extent has been accepted for the award of any other degree or diploma of a university or other institute of higher learning, except where due acknowledgement is made in the text. PUBLICATIONS FROM THIS WORK A large part of the work described in this thesis has now been published in journals and reported in conference proceedings.