@article {1918, title = {Ongoing build-up of refractory organic carbon in boreal soils during the Holocene}, journal = {Science}, volume = {314}, year = {2006}, note = {id: 1146}, month = {2006}, pages = {1283-1286}, author = {Smittenberg, R. H. and Eglinton, T. I. and Schouten, S. and Sinninghe-Damste, J. S.} }