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GONG, X., LÜ, Y., & LUO, G. (2007). Distribution Coefficient of Caprolactam and Methyl Caprolactam Using Benzene or Toluene as Extractants: Experiments and Prediction. Chinese Journal of Chemical Engineering, 15(4), 463–467. doi:10.1016/s1004-9541(07)60109-8 
10.1016/s1004-9541(07)60109-8