Piest, J. A. (2002). Exciting Polycyclic Aromatic Hydrocarbon Vibrations (University of Nijmegen). University of Nijmegen, Nijmegen, Netherlands. Retrieved from http://repository.ubn.ru.nl/handle/2066/19131 (Original work published 2002)
Piest, J. A., Oomens, J., Bakker, J., von Helden, G., & Meijer, G. (2001). Vibrational spectroscopy of gas-phase neutral and cationic phenanthrene in their electronic groundstates. Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy, 57, 717-735. (Original work published)