Al-Yassiri, Muntadar Abd Al-Barri Hussain, and Muthana Shanshal. 2015. “Reaction Pathways and Transition States of the C-C and C-H Bond Cleavage in the Aromatic Pyrene Molecule - A Density Functional Study”. European Journal of Chemistry 6 (3):261-69. https://doi.org/10.5155/eurjchem.6.3.261-269.1239.