218521document790981-s2.0-S0022519313003755-main.pdfapplication/pdfda0e60f1e079e5647c4fdd85635bbab8MD516807252017-09-12 09:09:11https://pure.iiasa.ac.at/id/eprint/10357/1/1-s2.0-S0022519313003755-main.pdf