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- [10] Ultra-trace analysis of 12 β 2 -agonists in pork, beef, mutton and chicken by ultrahigh-performance liquid-chromatography–quadrupole-orbitrap tandem mass spectrometry[J] . Changchuan Guo,Feng Shi,Liping Gong,Huijie Tan,Defu Hu,Jinling Zhang.Journal of Pharmaceutical and Biomedical Analysis . 2015