Chabbi, A., Rumpel, C., Grootes, P. M., González-Pérez, J. A., Delaune, R. D., Gonzalez-Vila, F., Nixdorf, B., Hüttl, R. F. J. (2006): Lignite degradation and mineralization in lignite-containing mine sediment as revealed by 14C activity measurements and molecular analysis. - Organic Geochemistry, 37, 8, 957-976.https://doi.org/10.1016/j.orggeochem.2006.02.002