Trigonometric parallaxes of high velocity halo white dwarf candidatesC. Ducourant, R. Teixeira, N. C. Hambly, B. R. Oppenheimer, M. R. S. Hawkins, M. Rapaport, J. Modolo and J. F. LecampionA&A, 470 1 (2007) 387-394DOI: https://doi.org/10.1051/0004-6361:20066876