Wolf, Gerhard Kunsthistorisches Institut in Florenz, MPI, Max Planck Society;
Wolf, G. (2005). Icons and sites: cult images of the Virgin in mediaeval Rome. In M. Vassilaki (Ed.), Images of the Mother of God: perceptions of the Theotokos in Byzantium (pp. 23-49). Aldershot [u.a.]: Ashgate.