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References

Castellanos P., Casassus S., Dickinson C., Vidal M., Paladini R., Cleary K., D. Davies R., J. Davis R., J. White G., Taylor A., Dust-correlated centimetre-wave radiation from the M78 reflection nebula, Monthly Notices of the Royal Astronomical Society, Volume 411, Issue 2, February 2011, Pages 1137–1150, https://doi.org/10.1111/j.1365-2966.2010.17743.x

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 Black, J. H. & Willner, S. P., Interstellar absorption lines in the infrared spectrum of NGC 2024 IRS 2, Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 15, 1984, p. 673-678., http://adsabs.harvard.edu/full/1984ApJ...279..673B

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S. Simón-Díaz, J. García-Rojas, C. Esteban, G. Stasińska, A. R. López-Sánchez and C. Morisset, A detailed study of the H II region M 43 and its ionizing star, A&A, Volume 530, June 2011, https://www.aanda.org/articles/aa/full_html/2011/06/aa16608-11/aa16608-11.html

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Pipher, J. L. & Soifer, B. T., Infrared observations of the H2O maser associated with the H II regions S 255 /IC 2162/ and S 257, Astronomy and Astrophysics, vol. 46, no. 2, Jan. 1976, p. 153-157, http://adsabs.harvard.edu/full/1976A%26A....46..153P 

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Sume, A. & Irvine, W. M., Radio observations of CH towards various galactic objects, Astronomy and Astrophysics, vol. 60, no. 3, Sept. 1977, p. 345-352, http://adsabs.harvard.edu/full/1977A%26A....60..345S 

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Jerzykiewicz, M., Kopacki, G., Molenda-Zakowicz, J., & Kolaczkowski, Z., A CCD Search for Variable Stars of Spectral Type B in the Northern Hemisphere Open Clusters. V. NGC 2169, Acta Astronomica, v.53, pp.151-165 (2003).,  http://adsabs.harvard.edu/full/2003AcA....53..151J 

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 McDavid, D. & Crisp, A., The Upper Main Sequence of the Open Cluster NGC 2169, Active OB-Stars: Laboratories for Stellar and Circumstellar Physics, ASP Conference Series, Vol. 361, Proceedings of the conference held 29 August - 2 September, 2005 at Hokkai-Gakuen University, Sapporo, Japan. Edited by S. Stefl, S. P. Owocki, and A. T. Okazaki. San Francisco: Astronomical Society of the Pacific, 2007., p.370-372, http://adsabs.harvard.edu/full/2007ASPC..361..370M 

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Siva Nagi Reddy Inturi, Makram Suidan, Panagiotis G. Smirniotis, Influence of synthesis method on leaching of the Cr-TiO2 catalyst for visible light liquid phase photocatalysis and their stability, Applied Catalysis B: Environmental, Volume 180, 2016, Pages 351-361, https://doi.org/10.1016/j.apcatb.2015.05.046 

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  and Characterizing the Stellar Population of NGC 1980, The American Astronomical Society., Volume 154, 2017, Number 1, https://iopscience.iop.org/article/10.3847/1538-3881/aa74df/meta 

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   ,,, and NGC 1980 Is Not a Foreground Population of Orion: Spectroscopic Survey of Young Stars with Low Extinction in Orion A, The Astronomical Journal, Volume 153, Number 4, 2017, https://iopscience.iop.org/article/10.3847/1538-3881/aa647b/meta

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Russell, R. W., Melnick, G., Gull, G. E., & Harwit, M., Detection of the 157 micron /1910 GHz/ /C II/ emission line from the interstellar gas complexes NGC 2024 and M42, Astrophysical Journal, Part 2 - Letters to the Editor, vol. 240, Sept. 1, 1980, p. L99-L103., http://adsabs.harvard.edu/full/1980ApJ...240L..99R 

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Gordon, M. A.,  The continuum spectra of dust complexes associated with W3 Main, M42, W49A, and W51A, Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 1, 1987, p. 258-264., http://adsabs.harvard.edu/full/1987ApJ...316..258G 

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