1. H. D. Evans, in: Protostars and Planets [Russian translation], Mir, Moscow (1982), p. 171.
2. V. A. Ambartsumyan, Soobshch. Byurakanskoi obs. 15, 3 (1954).
3. N. Zacharias, D. G. Monet, et al., The Naval Observatory Merged Astrometric Dataset (2005).
4. A. L. Gyulbudaghian, Astrophysics 41, 382 (1998).
5. R. Vera, Private communication (2015).