Quark-antiquark composite systems: the Bethe-Salpeter equation in the   spectral-integration technique
  The Bethe-Salpeter equations for the light-quark composite systems, q q-bar, are written in terms of spectral integrals. For the q q-bar -mesons characterized by the mass M, spin J and radial quantum number n, the equations are presented for the following (n,M^2)-trajectories: pi_J, eta_J, a_J, f_J, rho_J, omega_J, h_J and b_J. 
A.V. Anisovich, V.V. Anisovich, V.N. Markov, M.A. Matveev and A.V.   Sarantsev