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Lennon, D.; Lundie, D. T.; Jackson, S. D.; Kelly, G. J.; Parker, S. F. . (2002). Characterization of Activated Carbon Using X-ray Photoelectron Spectroscopy and Inelastic Neutron Scattering Spectroscopy. Langmuir, 18(12), 4667–4673. doi:10.1021/la011324j 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research