Narayana Suvarapu, Lakshmi, Young-Kyo Seo, and Sung-Ok Baek. 2012. “Concentrations of Polycyclic Aromatic Hydrocarbons in Indian Atmosphere During 1999-2011”. Asian Journal of Chemistry 24 (12):5463-65. https://asianpubs.org/index.php/ajchem/article/view/9905.