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Lopez-Ruiz, Nuria; Curto, Vincenzo F.; Erenas, Miguel M.; Benito-Lopez, Fernando; Diamond, Dermot; Palma, Alberto J.; Capitan-Vallvey, Luis F. . (2014). Smartphone-Based Simultaneous pH and Nitrite Colorimetric Determination for Paper Microfluidic Devices. Analytical Chemistry, 86(19), 9554–9562. doi:10.1021/ac5019205 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research