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Ourania Kretsi; Nektarios Aligiannis; Alexios Leandros Skaltsounis; Ioanna B. Chinou. (2003). Pyrrolizidine Alkaloids from <em>Onosma leptantha</em>. , 86(9), 3136–3140. doi:10.1002/hlca.200390254 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research