Proper motion of H2O masers in IRAS 20050+2720 MMS1: an AU scale jet associated with an intermediate-mass class 0 sourceR. S. Furuya, Y. Kitamura, A. Wootten, M. J. Claussen and R. KawabeA&A, 438 2 (2005) 571-583DOI: https://doi.org/10.1051/0004-6361:20034189