@article{MM2_1973__11_154220,
     author = {Klaus-J\"urgen Eckardt},
     title = {On the {Existence} of {Wave} {Operators} for {Dirac} {Operators.}},
     journal = {Manuscripta mathematica},
     pages = {359--372},
     publisher = {mathdoc},
     volume = {11},
     year = {1973},
     zbl = {0285.35057},
     url = {http://geodesic.mathdoc.fr/item/MM2_1973__11_154220/}
}