Other cases for which the Klein-Gordon equation is solvable can be found inL. Lam:Journ. Math. Phys.,12, 299 (1971), which also contains references to previous work. Additional references appear inH. H. Nickle andB. L. Beers:Journ. of Phys. A,5, 1658 (1972).
R. G. Newton:Scattering Theory of Waves and Particles (New York, N. Y., 1966), p. 420.
G. Calucci andG. C. Ghirardi:Nuovo Cimento,10 A, 121 (1972);13 A, 1119 (1973).
L. I. Schiff, H. Snyder andJ. Weinberg:Phys. Rev.,57, 315 (1940).
K. Veselić:Nucl. Phys.,147 A, 215 (1970).
Handbook of Mathematical Functions, edited byM. Abramowitz andI. A. Stegun (Washington, D. C., 1964), p. 505.
P. Jarratt andD. Nudds:Comput. Journ.,8, 62 (1965);J. P. Lavine:Journ. Comput. Phys.,12, 561 (1973).
G. Parzen:Phys. Rev.,80, 261 (1950)S. Rosendorff andS. Tani:Phys. Rev.,128, 457 (1962).
B. Schroer andJ. A. Swieca:Phys. Rev. D,2, 2938 (1970).
A. B. Migdal:Sov. Phys. JETP,34, 1184 (1972).