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Variations of absorbed photosynthetically active radiation over the Canadian Prairie in 2000-2008; Yang, Y; Wang, S;
Trishchenko, A P; Luo, Y; Geng, X. Journal of Agricultural Science vol. 4, no. 2, 2012 p. 57-68,
https://doi.org/10.5539/jas.v4n2p57 
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