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Zhang, L.-F.; Liu, G.; Wang, Y.-G.; Shen, J.; Li, R.-F.; Du, J.-K.; Yang, Z.-F.; Xu, Q.-B. . (2016). Modification of coal tar pitch with P-phthalaldehyde to reduce toxic PAH content. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 38(5), 737–743. doi:10.1080/15567036.2015.1128016 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research