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L. Briottet; R. Batisse; G. de Dinechin; P. Langlois; L. Thiers. (2012). Recommendations on X80 steel for the design of hydrogen gas transmission pipelines. , 37(11), 9423–9430. doi:10.1016/j.ijhydene.2012.02.009 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research