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Triple oxygen isotopes indicate urbanization affects source..:

Nelson, David M ; Tsunogai, Urumu ; Ding, Dong...
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324.  , 2018