1. World Health Organization, Health aspects of air pollution with particulate matter, ozone and nitrogen dioxide: Report on a WHO working group, Bonn, Germany 13-15 January 2003 (WHO Regional Office for Europe, Copenhagen, 2003).
2. World Health Organization, Nitrogen Dioxide,2000
3. Au nanoparticle modified WO3 nanorods with their enhanced properties for photocatalysis and gas sensing;Xiang;J. Phys. Chem. C,2010
4. High Surface Area Tunnels in Hexagonal WO3;Sun;Nano Lett.,2015
5. A review on WO3 based gas sensors: morphology control and enhanced sensing properties;Dong;J. Alloys Compounds J. Alloy. Compd.,2020