References
- Atherton, N. M., Cranwell, P. A., Floyd, A. J. & Haworth, R. D., 1967: Humic acid. 1. E. S. R. of humic acids. — Tetrahedron 23, 1653–1667.
- Gorham, E., 1960: Chlorophyll derivatives in surface muds from the English Lakes. — Limnol. Oceanogr. 5, 29–33.
- Gorham, E., 1961: Chlorophyll derivatives, sulphur and carbon in sediment cores from two English Lakes. — Canad. J. Bot. 39, 333–338.
- Gorham, E., Lund, J. W. G., Sanger, J. E. & Dean, W. E., Jr., 1974: Some relationships between algal standing crop, water chemistry, and sediment chemistry in the English Lakes. — Limnol. Oceanogr. 19, 601–617.
- Gorham, E. & Sanger, J. E., 1967: Plant pigments in woodland soils. — Ecology 48, 306–308.
- Mackereth, F. J. H., 1965: Chemical investigation of lake sediments and their interpretation. — Proc. Roy. Soc. B 161, 295–309.
- Mackereth, F. J. H., 1966: Some chemical observations on post-glacial lake sediments. — Phil. Trans. Roy. Soc. B 250, 165–213.
- Nelson, D. J. & Scott, D. C., 1962: Role of detritus in the productivity of a rock-outcrop community in a piedmont stream. — Limnol. Oceanogr. 7, 396–413.
- Otsuki, A. & Hanya, T., 1967: Some precursors of humic acid in Recent lake sediment suggested by infra-red spectra. — Geochim. Cosmochim. Acta 31, 1505–1515.
- Pennington, W., Haworth, E. Y., Bonny, A. P. & Lishman, J. P., 1972: Lake sediments in northern Scotland. — Phil. Trans. Roy. Soc. B 264, 191–294.
- Sanger, J. E., 1968: A quantitative study of leaf pigments from initiation in buds to decomposition in soils. — Ph. D. Thesis, Univ. Minnesota, Minneapolis, MN 55455. 252 p.
- Sanger, J. E. & Gorham, E., 1970: The diversity of pigments in lake sediments and its ecological significance. — Limnol. Oceanogr. 15, 59–69.
- Sanger, J. E. & Gorham, E., 1972: Stratigraphy of fossil pigments as a guide to the postglacial history of Kirchner Marsh, Minnesota. — Limnol. Oceanogr. 17, 840–854.
- Sanger, J. E. & Gorham, E., 1973: A comparison of the abundance and diversity of fossil pigments in wetland peats and woodland humus layers. — Ecology 54, 605–611.
- Tutin, W., 1969: The usefulness of pollen analysis in interpretation of stratigraphic horizons, both late-glacial and post-glacial. — Mitt. Internat. Verein. Limnol. 17, 154–164.
- Vallentyne, J. R., 1969: Sedimentary organic matter and paleolimnology. — Mitt. Internat. Verein. Limnol. 17, 104–110.