R. L. Fingerhut, M. L. McCall, M. De Robertis, R. L. Kingsburgh, M. Komljenovic, H. Lee & R. J. Buta: The Extinction and Distance of Maffei 1, The Astrophysical Journal, Vol. 587, Iss. 2, p. 683 (2003)
R. L. Fingerhut, M. L. McCall, M. De Robertis, R. L. Kingsburgh, M. Komljenovic, H. Lee & R. J. Buta: The Extinction and Distance of Maffei 1, The Astrophysical Journal, Vol. 587, Iss. 2, p. 672 (2003)
T. J. Davidge & S. van den Bergh: The Globular Cluster Content of Maffei 1, The Publications of the Astronomical Society of the Pacific, Vol. 117, Iss. 832, p. 589 (2005)