The Astrophysical Journal Supplement Series: 1989, vol: 71, issue:
1)- L J Allamandola, A G Tielens, J R Barker. Interstellar polycyclic aromatic hydrocarbons: the infrared emission bands, the excitation/emission mechanism, and the astrophysical implications.The Astrophysical journal. Supplement series. 1989, 71: 733-75