Kohnen, Mathieu E. L.; Peakman, T. M.; Sinninghe Damste, Jaap S.; De Leeuw, Jan W. (1990): Identification and occurrence of novel C (sub 36) -C (sub 54) 3,4-dialkylthiophenes with an unusual carbon skeleton in immature sediments. Pergamon, Oxford-New York, International, In: Durand, B. (editor), Behar, F. (editor), Advances in organic geochemistry, 1989; Part II, Molecular geochemistry; proceedings of the 14th international meeting on Organic geochemistry, 16 (4-6), 1103-1113, georefid:1991-053985

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