00325nam a2200133Ia 450000100060000000300040000600500170001000800410002704000110006804100080007908200190008710000200010624500650012617335Ost20260507155557.0251113s9999||||xx |||||||||||||| ||eng||  cnitttr  aeng  a300.722bY58C   aYin,  Robert K. 0aCase study research :b design and methods /cYin, Robert K.