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APA Citation
Li, Y., Jia, D., Wang, M., Liu, J., Fu, C., Yang, X., & Ai, C. (n.d.). hydraulic fracturing model featuring initiation beyond the wellbore wall for directional well in coal bed. Journal of geophysics and engineering, 13, 536–548. http://access.bl.uk/ark:/81055/vdc_100087555780.0x00002a