"nitrogen dioxide (CHEBI:33101)". Chemical Entities of Biological Interest (ChEBI). UK: European Bioinformatics Institute. 13 January 2008. Main. Archived from the original on 4 மார்ச்சு 2016. Retrieved 4 October 2011. {{cite web}}: Check date values in: |archive-date= (help)
"nitrogen dioxide (CHEBI:33101)". Chemical Entities of Biological Interest (ChEBI). UK: European Bioinformatics Institute. 13 January 2008. Main. Archived from the original on 4 மார்ச்சு 2016. Retrieved 4 October 2011. {{cite web}}: Check date values in: |archive-date= (help)