Bispectrum speckle interferometry of the massive protostellar outflow source AFGL 2591 T. Preibisch, Y. Y. Balega, D. Schertl and G. Weigelt A&A, 412 3 (2003) 735-743 Published online: 08 December 2003 DOI: 10.1051/0004-6361:20031449