Quirrenbach, A. Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;
Hummel, C. A., Mozurkewich, D., Elias II, N. M., Quirrenbach, A., Buscher, D. F., Armstrong, J. T., et al. (1994). Four years of astrometric measurements with the mark III optical interferometer. The Astronomical Journal, 108(1), 326-336.