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Mr S. Sarin; J. H. Scurr; P. D. Coleridge Smith. (1994). Stripping of the long saphenous vein in the treatment of primary varicose veins. , 81(10), 1455–1458. doi:10.1002/bjs.1800811017 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research