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Philipson, W. R.; Philipson, M. N. . (1973). A comparison of the embryology of <i>Forstera</i> L. and <i>Donatia</i> J. R. & G. Forst.. New Zealand Journal of Botany, 11(3), 449–460. doi:10.1080/0028825x.1973.10430295 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research