VLTI/AMBER spectro-interferometric imaging of VX Sagittarii's inhomogenous outer atmosphere A. Chiavassa, S. Lacour, F. Millour, T. Driebe, M. Wittkowski, B. Plez, E. Thiébaut, E. Josselin, B. Freytag, M. Scholz and X. Haubois A&A, 511 (2010) A51 Published online: 09 March 2010 DOI: 10.1051/0004-6361/200913288