Gordon, R. B.;Bertram, M.; Graedel, T. E.«Metal stocks and sustainability».Proceedings of the National Academy of Sciences,103,5,Gener 2006,p.1209–1214. DOI: 10.1073/pnas.0509498103. PMC: 1360560. PMID: 16432205.
Gordon, R. B.;Bertram, M.; Graedel, T. E.«Metal stocks and sustainability».Proceedings of the National Academy of Sciences,103,5,Gener 2006,p.1209–1214. DOI: 10.1073/pnas.0509498103. PMC: 1360560. PMID: 16432205.