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Karakashev, Stoyan I.; Nguyen, Phong T.; Tsekov, Roumen; Hampton, Marc A.; Nguyen, Anh V. . (2008). Anomalous Ion Effects on Rupture and Lifetime of Aqueous Foam Films Formed from Monovalent Salt Solutions up to Saturation Concentration. Langmuir, 24(20), 11587–11591. doi:10.1021/la801456j 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research