CZ:Ref:DOI:10.1073/pnas.142033699

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Wackernagel, M.; N.B. Schulz & D. Deumling et al. (2002), "Tracking the ecological overshoot of the human economy", Proc Natl Acad Sci US A 99 (14): 9266–9271, DOI:10.1073/pnas.142033699 [e]