Near-infrared spectro-interferometry of three OH/IR stars with the VLTI/AMBER instrument A. E. Ruiz-Velasco, M. Wittkowski, A. Wachter, K.-P. Schröder and T. Driebe A&A, 535 (2011) A100 Published online: 18 November 2011 DOI: 10.1051/0004-6361/201117994