共 50 条
- [6] WHY IS IMPLEMENTATION SO DIFFICULT [J]. MANAGEMENT SERVICES IN GOVERNMENT, 1978, 33 (04): : 169 - 176
- [7] Adherence to HAART: Why is it so difficult? [J]. ARCHIVES OF INTERNAL MEDICINE, 2002, 162 (10) : 1197 - 1197
- [10] WHY ARE INTERACTIONS SO DIFFICULT TO DETECT [J]. BEHAVIORAL AND BRAIN SCIENCES, 1990, 13 (01) : 140 - &