CZ:Ref:PMID:15238298
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Fields S (2004). "Global nitrogen: cycling out of control". Environ Health Perspect 112 (10): A556-63. PMID 15238298. PMC PMC1247398. [e]
Fields S (2004). "Global nitrogen: cycling out of control". Environ Health Perspect 112 (10): A556-63. PMID 15238298. PMC PMC1247398. [e]