• http://theses.ncl.ac.uk/jspui/handle/10443/6360
• http://theses.ncl.ac.uk/jspui/handle/10443/6361
• http://theses.ncl.ac.uk/jspui/handle/10443/6362
• http://theses.ncl.ac.uk/jspui/handle/10443/6364
• http://theses.ncl.ac.uk/jspui/handle/10443/6365
• http://theses.ncl.ac.uk/jspui/handle/10443/6366
• http://theses.ncl.ac.uk/jspui/handle/10443/6367
• http://theses.ncl.ac.uk/jspui/handle/10443/6368
• http://theses.ncl.ac.uk/jspui/handle/10443/6369
• http://theses.ncl.ac.uk/jspui/handle/10443/6370
• http://theses.ncl.ac.uk/jspui/handle/10443/6371
• http://theses.ncl.ac.uk/jspui/handle/10443/6372
• http://theses.ncl.ac.uk/jspui/handle/10443/6373
• http://theses.ncl.ac.uk/jspui/handle/10443/6374
• http://theses.ncl.ac.uk/jspui/handle/10443/6375
• http://theses.ncl.ac.uk/jspui/handle/10443/6376
• http://theses.ncl.ac.uk/jspui/handle/10443/6377
• http://theses.ncl.ac.uk/jspui/handle/10443/6378
• http://theses.ncl.ac.uk/jspui/handle/10443/6379
• http://theses.ncl.ac.uk/jspui/handle/10443/6380
• http://theses.ncl.ac.uk/jspui/handle/10443/6381
• http://theses.ncl.ac.uk/jspui/handle/10443/6382
• http://theses.ncl.ac.uk/jspui/handle/10443/6383