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Sandstrom, Karin M.; Peek, J. E. G.; Bower, Geoffrey C.; Bolatto, Alberto D.; Plambeck, Richard L. (2007). "A Parallactic Distance of 389+24-21 Parsecs to the Orion Nebula Cluster from Very Long Baseline Array Observations". The Astrophysical Journal667 (2): 1161. Bibcode:2007ApJ...667.1161S. arXiv:0706.2361. doi:10.1086/520922.
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Benjamin, Robert A.; Churchwell, E.; Babler, Brian L.; Bania, T. M.; Clemens, Dan P.; Cohen, Martin; Dickey, John M.; Indebetouw, Rémy; et al. (2003). "GLIMPSE. I. An SIRTF Legacy Project to Map the Inner Galaxy". Publications of the Astronomical Society of the Pacific115 (810): 953–964. Bibcode:2003PASP..115..953B. arXiv:astro-ph/0306274. doi:10.1086/376696.
Feigelson, E. D.; Decampli, W. M. (1981). "Observations of X-ray emission from T-Tauri stars". Astrophysical Journal Letters243: L89–L93. Bibcode:1981ApJ...243L..89F. doi:10.1086/183449.
Montmerle, T.; et al. (1983). "Einstein observations of the Rho Ophiuchi dark cloud - an X-ray Christmas tree". Astrophysical Journal, Part 1269: 182–201. Bibcode:1983ApJ...269..182M. doi:10.1086/161029.
M. G. Wolfire; J. P. Cassinelli (1987). "Conditions for the formation of massive stars". Astrophysical Journal319 (1): 850–867. Bibcode:1987ApJ...319..850W. doi:10.1086/165503.
I. A. Bonnell; M. R. Bate; C. J. Clarke; J. E. Pringle (1997). "Accretion and the stellar mass spectrum in small clusters". Monthly Notices of the Royal Astronomical Society285 (1): 201–208. Bibcode:1997MNRAS.285..201B. doi:10.1093/mnras/285.1.201.