Ayres، Thomas R.؛ Simon، Theodore؛ Stern، Robert A.؛ Drake، Stephen A.؛ Wood، Brian E.؛ Brown، Alexander (1998). "The Coronae of Moderate-Mass Giants in the Hertzsprung Gap and the Clump". The Astrophysical Journal. ج. 496: 428. Bibcode:1998ApJ...496..428A. DOI:10.1086/305347.
Ayres، Thomas R.؛ Simon، Theodore؛ Stern، Robert A.؛ Drake، Stephen A.؛ Wood، Brian E.؛ Brown، Alexander (1998). "The Coronae of Moderate-Mass Giants in the Hertzsprung Gap and the Clump". The Astrophysical Journal. ج. 496: 428. Bibcode:1998ApJ...496..428A. DOI:10.1086/305347.