2Nolte J, Eller P, Ringel SP. Shifting toward problem-based learning in a medical school neurobiology course [J]. Proc Annu Conf Res Med Educ, 2003,27:66-71.
3Evensen DH, Hmelo CE. Problem based learning: A research perspective on learning interactions [M]. Mahwah New Jersey: Lawrence Erllbaum Associates. 2000.