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Dianne E. Stewart and Franklin H. Farmer. (1984). Extraction, Identification, and Quantitation of Phycobiliprotein Pigments from Phototrophic Plankton. Limnology and Oceanography, 29(2), 392–397. doi:10.2307/2836340 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research