Combination of nulling interferometer and modified pupil for observations of exo-planets J. Nishikawa, T. Kotani, N. Murakami, N. Baba, Y. Itoh and M. Tamura A&A, 435 1 (2005) 379-384 Published online: 25 April 2005 DOI: 10.1051/0004-6361:20042424