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A. Freitag

Chapin, F. S., III, Mary E. Power, Steward T. A. Pickett, A. Freitag, J. A. Reynolds, R.B. Jackson, D.M. Lodge, et al. 2011. “Earth Stewardship: Science for Action to Sustain the Human-Earth System”. Ecosphere 2 (8): art89. doi:10.1890/ES11-00166.1.