1. For review and detailed references see K.K. Seth, 1984 Workshop on Electron. and Photon interactions at medium energies, Bonn, edited in “Lectures notes in physics” Springer-Verlag
2. Dibaryon resonances
3. S.M. Dorkin, B.L. Reznik and A.I. Titov JINR p4-81-791, Dubna, (in russian).