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APA Citation
Zhang, C., Jin, Z., Song, X., Feng, G., Li, Z., Gao, R., Zhu, D., & Li, C. (2020). failure mechanism and fracture aperture characteristics of hard thick main roof based on voussoir beam structure in longwall coal mining. Energy science & engineering, 8(2), 340–352. http://access.bl.uk/ark:/81055/vdc_100099989634.0x000009