The Mira variable S Orionis: relationships between the photosphere, molecular layer, dust shell, and SiO maser shell at 4 epochsM. Wittkowski, D. A. Boboltz, K. Ohnaka, T. Driebe and M. ScholzA&A, 470 1 (2007) 191-210DOI: https://doi.org/10.1051/0004-6361:20077168
