@article{GDZPPN00221945X,
title = {On the Existence of Wave Operators for The Klein-Gordon Equation.},
journal = {Manuscripta mathematica},
volume = {18},
year = {1976},
pages = {43-56},
zbl = {0316.35073},
url = {http://dml.mathdoc.fr/item/GDZPPN00221945X}
}
Eckardt, Klaus-Jürgen. On the Existence of Wave Operators for The Klein-Gordon Equation.. Manuscripta mathematica, Tome 18 (1976) pp. 43-56. http://gdmltest.u-ga.fr/item/GDZPPN00221945X/