5014document3477DongYPhDthesis_ab+yd+hd.pdfapplication/pdf3999eb4b75426057b29d4689db29209fMD5155465762011-07-19 16:36:36http://etheses.bham.ac.uk//id/eprint/1455/1/DongYPhDthesis_ab%2Byd%2Bhd.pdf