Gross, A., Turner, Benjamin L., Wright, S. Joseph, Tanner, Edmund V. J., Reichstein, M., Weiner, T., and Angert, A. 2015. "Oxygen isotope ratios of plant available phosphate in lowland tropical forest soils." Soil Biology and Biochemistry. 8:354–361. https://doi.org/10.1016/j.soilbio.2015.06.015