J. Libich, P. Harmanec, J. Vondrák, S. Yang, P. Hadrava, C. Aerts, P. DeCat, P. Koubský, P. Škoda, M. Šlechta, K. Uytterhoeven & P. Mathias: The new orbital elements and properties of ɛ Persei, Astronomy & Astrophysics, Vol. 446, Iss. 2, p. 589 (2006)
V. V. Dushin, A. F. Kholtygin, G. A. Chuntonov & D. O. Kudryavtsev: Rapid Spectral Variability of ε Per A, Astrophysical Bulletin, Vol. 68, No. 2, p. 185 (2013)