26941document15948Hegenbarth_11_MPhil_redacted.pdfapplication/pdf8e3ce9fbaf2e7f0e51dcffe8309aa38fMD57470322011-11-10 13:09:41http://etheses.bham.ac.uk//id/eprint/2912/1/Hegenbarth_11_MPhil_redacted.pdf