Institution: | 1. School of Mathematics and Statistics, Ningxia University, Yinchuan 750021, PR China;2. School of Preparatory Education, North Minzu University, Yinchuan 750021, PR China;1. Faculty of Graduate Studies, Dalhousie University, 6420 Coburg Road, P O Box 15000, Halifax, NS B3H 4R2, Canada;2. School of Social Work, Massey University, Private Bag 11 222 Palmerston North, New Zealand;3. School of Social Work, Massey University, Private Bag, 11 222 Palmerston North, New Zealand |