Hummel, C. A., Mozurkewich, D., Elias II, N. M., Quirrenbach, A., Buscher, D. F., Armstrong, J. T., Johnston, K. J., Simon, R. S., & Hutter, D. J. (1994). Four years of astrometric measurements with the mark III optical interferometer. The Astronomical Journal, 108(1), 326-336.