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Van Krevelen, D.W., Chermin, H.A.G., 1951. Estimation of the free enthalphy (Gibbs free energy) of formation of organic compounds from group contributions. Chemical Engineering Science 1, 66-80.
Van Krevelen, D.W., Chermin, H.A.G., 1952. Erratum: Estimation of the free enthalphy (Gibbs free energy) of formation of organic compounds from group contributions. Chemical Engineering Science 1, 238.
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