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Cai, Jingxuan; Zhang, Cuiping; Khan, Arshad; Liang, Chuwei; Li, Wen-Di . (2018). Highly transparent and flexible polyaniline mesh sensor for chemiresistive sensing of ammonia gas. RSC Advances, 8(10), 5312–5320. doi:10.1039/c7ra13516e 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research