References
- Hedges, J. I. & Ertel, J. R., 1982: Characterization of lignin by gas capillary chromatography of cupric oxide oxidation products. — Anal. Chem. 54: 174–178.
- Hedges, J. I., Ertel, J. R. & Leopold, E. B., 1982: Lignin geochemistry of a Late Quaternary sediment core from Lake Washington. — Geochim. Cosmochim. Acta 46: 1869–1877.
- Hedges, J. I. & Mann, D. C., 1979: The characterization of plant tissues by their lignin oxidation products. — Geochim. Cosmochim. Acta 43: 1803–1807.
- Ishiwatari, R. & Uzaki, M., 1987: Diagenetic changes of lignin compounds in a more than 0.6 million-year-old lacustrine sediment (Lake Biwa, Japan). — Geochim. Cosmochim. Acta 51: 321–328.
- Leopold, E. B., Nickmann, R., Hedges, J. I. & Ertel, J. R., 1982: Pollen and lignin records of Late Quaternary vegetation, Lake Washington. — Science 218: 1305–1307.