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Ravishankar, Basavaias; Dound, Yogesh A.; Mehta, Dilip S.; Ashok, Basti Krishana; de Souza, Anselm; Pan, Min-Hsiung; Ho, Chi-Tang; Badmaev, Vladimir; Vaidya, Ashok D.B. . (2015). Safety assessment of menaquinone-7 for use in human nutrition. Journal of Food and Drug Analysis, 23(1), 99–108. doi:10.1016/j.jfda.2014.03.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research