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Ashutosh Kumar; Alok K. Pandey; Shashi S. Singh; Rishi Shanker; Alok Dhawan. (2011). Engineered ZnO and TiO2 nanoparticles induce oxidative stress and DNA damage leading to reduced viability of Escherichia coli. , 51(10), 1872–1881. doi:10.1016/j.freeradbiomed.2011.08.025 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research