@conference {8911,
	title = {Marginal CO2 abatement costs for the Portuguese energy system - scenarios analysis for 2030},
	booktitle = {9th International Conference Energy for a Clean Environment},
	year = {2007},
	month = {2-4 July},
	address = {Povoa de Varzim, Portugal},
	author = {Cleto, Jo{\~a}o and Sim{\~o}es, Sofia and Patr{\'\i}cia Fortes and J{\'u}lia Seixas}
}
