Perhaps you should try some spelling variations:
policy simulation » policy simulations, policy formulation, policy regulation
simulation models » simulation model
5.3 communication » 2.3 communication, 4.3 communication, 1.3 communication
developing long » developing global
4 developing » 3 developing
long afrique » en afrique, l afrique
models care » models case, models cge
care 5.3 » care 3
costs 4 » costs _, costs a, costs 4.2

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technology policy simulation models care 5.3 communication costs 4 developing long afrique.*.