http://en.wikipedia.org/wiki/Photosynthesis
http://www.biology4kids.com/files/plants_photosynthesis.html
http://www.life.illinois.edu/govindjee/paper/gov.html
http://www.britannica.com/EBchecked/topic/458172/photosynthesis
http://biology.clc.uc.edu/courses/bio104/photosyn.htm
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