A. Brunthaler,
I. Martí-Vidal,
K. M. Menten,
M. J. Reid,
C. Henkel,
G. C. Bower,
H. Falcke,
H. Feng,
P. Kaaret,
N. R. Butler et al. (2 more)
A&A, 516 (2010) A27
Published online: 22 June 2010
DOI: 10.1051/0004-6361/201014133
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