1. Campbell, B. and Walker, G. A. H.: 1979,Publ. Astron. Soc. Pacific 91, 540.
2. Campbell, B., Walker, G. A. H. and Yang, S.: 1988,Astrophys. J. 331, 902.
3. Cochran, W. D.: 1988,Astrophys. J. 334, 349.
4. Cochran W. D., Hatzes, A. P. and Hancock, T. J.: 1991, ?Letters to the Editor,?Astrophys. J.,380, L35.
5. Fahlman, G. G. and Glaspey, J. W.: 1973, ?A Technique for Measuring Small Displacements in Digital Spectra? inAstronomical Observations with Television Type Sensors, eds., Glaspey, J. W. and Walker, G. A. H., Inst. of Astronomy and Space Science: Vancouver, 347.