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3. Photosynthesis and photorespiration: Biochemistry, physiology and ecological implications;Ehleringer;HortScience,1979
4. Comparison of fluorescent lamps, high pressure mercury halid and high pressure sodium vapor lamps as supplementary light to Begonia × hiemalis during the winter season;Hagen;Department of Floriculture and Greenhouse Crops, The Agricultural University of Norway, Melding No. 213,1980