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Changqing Liu , 2013. Principal Factors Affecting China Zero Environmental Risk: Behavior and Area Angle. Journal of Applied Sciences, 13: 1422-1428.
DOI: 10.3923/jas.2013.1422.1428
URL: https://scialert.net/abstract/?doi=jas.2013.1422.1428
DOI: 10.3923/jas.2013.1422.1428
URL: https://scialert.net/abstract/?doi=jas.2013.1422.1428