Kenyon SJ.
Recent Activity in Two Symbiotic Stars. Journal of the American Association of Variable Star Observers (JAAVSO). 1986;15 (2) :173-180.
Dupree A K, Baliunas S-L, Guinan E F, Hartmann L, Sonneborn G S.
Recent Spectroscopic Observations of Alpha Orionis. In:
Zeilik M, Gibson DM Cool Stars, Stellar Systems and the Sun. Vol. 254. ; 1986. pp. 411.