no. 1
Asymptotics for □u=m 2 u+G(t,x,u,u x ,u t ),, II. Scattering theory
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Serie 3, Volume 26 (1972) no. 1, pp. 67-95.
follows Asymptotics for □u=m 2 u+G(x,t,u,u x ,u t ), I. Global existence and decay 
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     author = {Chadam, John M.},
     title = {Asymptotics for $\square \, u = m^2 u + G (t, x, u, u_x, u_t),$, {II.} {Scattering} theory},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
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     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 26},
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Chadam, John M. Asymptotics for $\square \, u = m^2 u + G (t, x, u, u_x, u_t),$, II. Scattering theory. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Serie 3, Volume 26 (1972) no. 1, pp. 67-95. http://archive.numdam.org/item/ASNSP_1972_3_26_1_67_0/

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[2] I.E. Segal, Dispersion for Non-linear Relativistic Equations, II, Ann. Scient. Ec. Norm. Sup., ser. 4, 1, 459-497, (1968). | Numdam | MR | Zbl

[3] W.A. Strauss, Decay and Asympotics for □u = F (u), J. Functional Anal., 2, 409-457, (1968). | Zbl

[4] I.E. Segal, Non-linear Semi-groups, Ann. Math., 78 389-364, (1963). | MR | Zbl

[5] K. Yosida, Functional Analysis, Springer, Berlin-Göttingen-Heidelberg, 1965. | Zbl

[6] N. Shenk and D. Thoe, Outgoing Solutions of (- Δ + q - k2) u = f in an Exterior Domain, J. Math Anal. Applic, 31, 81-116, (1970). | Zbl