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4. Jacobson MZ, et al. 100% clean and renewable wind, water, and sunlight (WWS) all sector energy roadmaps for 139 countries of the world 13 December 2015, 〈http://web.stanford.edu/group/efmh/jacobson/Articles/I/CountriesWWS.pdf〉. The Groups also mantains an interesting website at the URL: 〈https://100.org/wp-addons/maps/#〉 [accessed 08.01.16].
5. The Solar Economy;Scheer,2004