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Voronkov, Artem; Iwaya, Leonardo Horn; Martucci, Leonardo A.; Lindskog, Stefan . (2017). Systematic Literature Review on Usability of Firewall Configuration. ACM Computing Surveys, 50(6), 1–35. doi:10.1145/3130876 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research