Photoproduction of η -mesons on the deuteron above S11(1535) in the presence of a narrow P11(1670) -resonanceA. Fix, L. Tiator and M. V. PolyakovEur. Phys. J. A, 32 3 (2007) 311-319DOI: https://doi.org/10.1140/epja/i2007-10385-6