Nakicenovic, N. <https://pure.iiasa.ac.at/view/iiasa/214.html> ORCID: https://orcid.org/0000-0001-7176-4604 <https://orcid.org/0000-0001-7176-4604>  (1994).  Energy Gases - The Methane Age and Beyond.   IIASA Research Report (Reprint). IIASA, Laxenburg, Austria: RR-94-008. Reprinted from The Future of Energy Gases, 1570(1994) [1994].