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Parkin, John. (2012). [Transport and Sustainability] Cycling and Sustainability Volume 1 || Chapter 2 Cycling Cultures in Northern Europe: From ‘Golden Age’ to ‘Renaissance’. , 10.1108/S2044-9941(2012)1(), 23–58. doi:10.1108/S2044-9941(2012)0000001004 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research