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2. http://inhabitat.com/kyocera-opens-japans-largest-offshore-solar-power-plant/.
3. http://www.bristolpost.co.uk/Solar-tree-sculpture-planned-Bristol-s-Millennium/story-24582860-detail/story.html.
4. http://www.brookings.edu/research/articles/2014/11/indonesia-maritime-liow-shekhar.