VLBI astrometry of circumstellar OH masers: Proper motions and parallaxes of four AGB starsW. H. T. Vlemmings, H. J. van Langevelde, P. J. Diamond, H. J. Habing and R. T. SchilizziA&A, 407 1 (2003) 213-224DOI: https://doi.org/10.1051/0004-6361:20030766
