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Olard, François; Perraton, Daniel . (2010). On the Optimization of the Aggregate Packing Characteristics for the Design of High-Performance Asphalt Concretes. Road Materials and Pavement Design, 11(sup1), 145–169. doi:10.1080/14680629.2010.9690330 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research