@misc{aei2941,
           pages = {26},
            year = {1990},
           title = {Political Union. Commission opinion of 21 October 1990 on the proposal for amendment of the treaty establishing the European Economic Community with a view to political union. COM 90) 600 final, 21 October 1990},
             url = {http://aei.pitt.edu/941/}
}