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Ravichandran, K.; Chidhambaram, N.; Arun, T.; Velmathi, S.; Gobalakrishnan, S. . (2016). Realizing cost-effective ZnO:Sr nanoparticles@graphene nanospreads for improved photocatalytic and antibacterial activities. RSC Adv., 6(72), 67575–67585. doi:10.1039/c6ra08697g 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research