Comment on the paper: ``Feynman-Schwinger representation approach to nonperturbative physics'' by C. Savkli et al. [Phys. Rev. C 60, 055210 (1999), hep-ph/9906211]

R. Rosenfelder, A. W. Schreiber

We point out that the scalar Wick-Cutkosky model (with ${\chi }^2\varphi$ interaction) used in this study has been known for a long time to be unstable. However, the numerical results present…