1. Bray, R.J., Loughhead, R.E.: 1978, Astrophys J. 224, 276
2. Deming, D., Espenak, F., Jennings, D.E., Brault, J.W., Wagner, J.: 1987, Astrophys J. 316, 771
3. Dravins, D.: 1987, Astron.Astrophys.
172, 200
4. Dravins, D., Larsson, B., Nordlund, A.: 1986, Astron.Astrophys.
158, 83
5. Dravins, D., Lindegren, L.: 1982, Convection in Stellar Atmospheres, observing program for the ESA astrometry satellite HIPPARCOS