WASET
    F.C. Amadi and  G. C. Enyi and  G. G. Nasr,  Optimization of Multi-Zone Unconventional (Shale) Gas Reservoir Using Hydraulic Fracturing Technique.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2015, vol. 106(10). 1277 - 1281
    [viewed 10 May 2024]. Available from: https://publications.waset.org/pdf/10002829.