J, H, K spectro-interferometry of the Mira variable S Orionis M. Wittkowski, D. A. Boboltz, T. Driebe, J.-B. Le Bouquin, F. Millour, K. Ohnaka and M. Scholz A&A, 479 1 (2008) L21-L24 Published online: 09 January 2008 DOI: 10.1051/0004-6361:20079237