1. The oil market as an oligopoly;Berger,1988
2. The greenhouse effect;Grubb,1989
3. Global, regional and national carbon dioxide emissions 1949–1986;Halvorsen,1989
4. Efficient international agreements for reducing emissions of CO2;Hoel;The Energy Journal,1991
5. International environmental conventions: The case of uniform reductions;Hoel;Environmental and Resource Economics,1991