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APA Citation
Meyerson, L. A., Baron, J., Melillo, J. M., Naiman, R. J., O'Malley, R. I., Orians, G., Palmer, M. A., Pfaff, A. S., Running, S. W., & Sala, O. E. (2005). aggregate measures of ecosystem services: can we take the pulse of nature?. Frontiers in ecology and the environment, 3(1), 56–59. http://access.bl.uk/ark:/81055/vdc_100028655113.0x000051