1. Collins, G.W., II and Sonneborn, G.H.: 1977, Astrophys. J. Suppl. Series
34, 41
2. Hoffleit, D. and Jaschek, C.: 1982, The Bright Star Catalogue, Yale Univ. Obs.
3. Hoffleit, D., Saladyga, M. and Wlasuk P.: 1983, A Supplement to the Bright Star Catalogue, Yale Univ. Obs.
4. Zorec, J. and Briot, D.: 1991, Astron.Astrophys.
245, 150