Partial-wave scattering matrix mu = reduced mass in the two-meson system. gnl = arbitrary real coupling constants.   EvB and GR, arXiv:hep-ph/0304105,   Int. J. Theor. Phys. Group Theor. Nonlin. Opt. 11, 179 (2006).   EvB, Zeit. Phys. C17, 135 (1983).