A Field Study Implementing New Monitoring Technology for Roof Caving and Systematic Monitoring for Gob-Side Entry Retaining via Roof Cutting in Underground Coal Mining. - Ying Chen; Zikai Zhang; Chen Cao 006; Zhaoju Zhang; Jun Han; Qianjia Hui; Bingjie Huo; Fengshuo Jia; Zhijie Zhu; Yang Chen (Sensors, 2023)