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Lixia Cheng;Renxin Wang;Xiaojian Hao;Guochang Liu;. (2021). Design of Flexible Pressure Sensor Based on Conical Microstructure PDMS-Bilayer Graphene . Sensors, (), –. doi:10.3390/s21010289 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research