High-resolution imaging of ultracompact HII regions - III. G11.11-0.40 and G341.21-0.21 Th. Henning, M. Feldt, B. Stecklum and R. Klein A&A, 370 1 (2001) 100-111 Published online: 15 April 2001 DOI: 10.1051/0004-6361:20010227