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Zagami, A.S.; Lambert, G.A.; Lance, J.W. . (1987). Studies In The Cat On The Pathway For Vascular Head Pain. Cephalalgia, 7(6_suppl), 7–9. doi:10.1177/03331024870070s602 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research