SiO masers in TX Cam - Simultaneous VLBA observations of two 43 GHz masers at four epochs Jiyune Yi, R. S. Booth, J. E. Conway and P. J. Diamond A&A, 432 2 (2005) 531-545 Published online: 02 March 2005 DOI: 10.1051/0004-6361:20041658