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Wittkowski، M.؛ Boboltz، D. A.؛ Ohnaka، K.؛ Driebe، T.؛ Scholz، M. (2007). "The Mira variable S Orionis: Relationships between the photosphere, molecular layer, dust shell, and SiO maser shell at 4 epochs". Astronomy and Astrophysics. ج. 470: 191. arXiv:0705.4614. Bibcode:2007A&A...470..191W. DOI:10.1051/0004-6361:20077168.
Wittkowski، M.؛ Boboltz، D. A.؛ Ohnaka، K.؛ Driebe، T.؛ Scholz، M. (2007). "The Mira variable S Orionis: Relationships between the photosphere, molecular layer, dust shell, and SiO maser shell at 4 epochs". Astronomy and Astrophysics. ج. 470: 191. arXiv:0705.4614. Bibcode:2007A&A...470..191W. DOI:10.1051/0004-6361:20077168.
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