Approximate solutions in the model $\mathscr L_{\mathrm{int}}=h^2\psi^2\varphi^2$ and equations for Green's functions on paths
B. M. Barbashov, V. V. Nesterenko

This publication is cited in the following articles:

1. V. P. Maslov, A. M. Chebotarev, “Jump-type processes and their applications in quantum mechanics”, J. Soviet Math., 13:3 (1980), 315–358