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E. G. Celius; C. Smestad. (2009). Change in sex ratio, disease course and age at diagnosis in Oslo MS patients through seven decades. , 120(Supplement s189), 27–29. doi:10.1111/j.1600-0404.2009.01208.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research