Paper and carbon ink enabled low-cost, eco-friendly, flexible, multifunctional pressure and humidity sensors - Duan, Zaihua; Jiang, Yadong; Huang, Qi; Wang, Si; Wang, Yang; Pan, Hong; Zhao, Qiuni; Xie, Guangzhong; Du, Xiaosong; Tai, Huiling (Smart materials and structures, 2021)