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title = {{Geological perspectives on carbon dioxide and the carbon cycle}},  booktitle = {The Carbon Cycle and Atmospheric {CO}2: Natural Variations Archean to Present},  }  @article{van_Hees_2000,  doi = {10.1016/s0016-7061(98)00140-2},  url = {http://dx.doi.org/10.1016/s0016-7061(98)00140-2},  year = {2000},  month = {feb},  publisher = {Elsevier {BV}},  volume = {94},  number = {2-4},  pages = {173--200},  author = {P.A.W van Hees and U.S Lundström and R Giesler},  title = {{Low molecular weight organic acids and their Al-complexes in soil solution{\textemdash}composition distribution and seasonal variation in three podzolized soils}},  journal = {Geoderma},  }