@article{roscoe_buurman_van lagen_velthorst_2004,  title={Transformations in occluded light fraction organic matter in a clayey oxisol: evidence from 13C-CPMAS-NMR and delta13C Signature},  volume={28},  ISSN={0100-0683},  url={https://doi.org/10.1590/S0100-06832004000500003},  DOI={10.1590/S0100-06832004000500003},  number={5},  journal={Revista Brasileira de Ciência do Solo},  publisher={Sociedade Brasileira de Ciência do Solo},  author={Roscoe, R. and Buurman, P. and van Lagen, B. and Velthorst, E.},  year={2004},  month={Sep},  pages={811–818} }