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Qiuju, You, Fan Jianchun, and Zhu Wei. "Risk assessment and control measures of accident gas in Beijing." \i Journal of Safety Science and Technology\i0  7, no. 10 (2011): 93-99.\par \par Qiu-ju, You, Zhu Wei, and Bai Yong-qiang. "Fault tree analysis on risk factors of underground gas networks of Beijing city." \i Oil & Gas Storage and Transportation\i0  28, no. 9 (2009): 24-30.\par \par }