J. I. Hedges, Hu, F. S., Devol, A. H., Hartnett, H. E., Tsamakis, E., and Keil, R. G.,
“Sedimentary organic matter preservation: A test for selective degradation under oxic conditions”,
American Journal of Science, vol. 299, no. 7-9, pp. 529-555, 1999.