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Mellema, G.; Raga, A. C.; Canto, J.; Lundqvist, P.; Balick, B.; Steffen, W.; Noriega-Crespo, A. Photo-evaporation of clumps in planetary nebulae. Astronomy and Astrophysics. 1998, 331: 335. Bibcode:1998A&A...331..335M. arXiv:astro-ph/9710205.
Hester, J. J.; Scowen, P. A.; Sankrit, R.; Lauer, T. R.; Ajhar, E. A.; Baum, W. A.; Code, A.; Currie, D. G.; Danielson, G. E.; Ewald, S. P.; Faber, S. M.; Grillmair, C. J.; Groth, E. J.; Holtzman, J. A.; Hunter, D. A.; Kristian, J.; Light, R. M.; Lynds, C. R.; Monet, D. G.; O'Neil, E. J.; Shaya, E. J.; Seidelmann, P. K.; Westphal, J. A. Hubble Space Telescope WFPC2 Imaging of M16: Photoevaporation and Emerging Young Stellar Objects. Astronomical Journal. 1996, 111: 2349. Bibcode:1996AJ....111.2349H. doi:10.1086/117968.
Liffman, Kurt. The Gravitational Radius of an Irradiated Disk. Publications of the Astronomical Society of Australia. 2003, 20 (4): 337. Bibcode:2003PASA...20..337L. doi:10.1071/AS03019.