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Van Vierssen, W.; Van Wijk, R.J.; Van der Zee, J.R. . (1981). Some additional notes on the cytotaxonomy of Ruppia taxa in Western Europe. Aquatic Botany, 11(), 297–301. doi:10.1016/0304-3770(81)90067-X 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research