Numerical-Well-Testing Interpretation of Injection/Falloff Testing for Coalbed Methane Well in Hedong Coalfield by Shiyue Fang, Xujing Zhang, Xinzhan Li, Yue Chen, Baiyi He, Yuan Bao, Dongmin Ma

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A two-sample multivariate test with one covariance matrix unknown by Samruam Chongcharoen, Manachai Rodchuen

Subjects: “…approximate degrees of freedom…”
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