Adelman, S. J. (June 1997), "On the possible variability of metallic-line and Mercury-Manganese stars", Astronomy & Astrophysics Supplement Series, 123 (3): 445–447, Bibcode:1997A&AS..123..445A, doi:10.1051/aas:1997167.
Kholopov, P. N.; et al. (February 1981), "65th Name-List of Variable Stars", Information Bulletin on Variable Stars, 1921: 1, Bibcode:1981IBVS.1921....1K.
Adelman, S. J. (June 1997), "On the possible variability of metallic-line and Mercury-Manganese stars", Astronomy & Astrophysics Supplement Series, 123 (3): 445–447, Bibcode:1997A&AS..123..445A, doi:10.1051/aas:1997167.