[23] Stima tratta dallo studio intitolato "Design of a practical approach to greenhouse gas emissions trading combined with policies and measures in the EC", Center for Clean Air Policy, Washington DC, (prossimamente all'indirizzo: [http ...]
[23] Schätzung nach "Design of a practical approach to greenhouse gas emissions trading combined with policies and measures in the EC", Center for Clean Air Policy, Washington DC, (demnächst: [http ...]