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T.Y. Kuang; J.H. Argyroudi-Akoyunoglou; H.Y. Nakatani; J. Watson; C.J. Arntzen. (1984). The origin of the long-wavelength fluorescence emission band (77°K) from photosystem I. , 235(2), 0–627. doi:10.1016/0003-9861(84)90236-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research