@article{02028922,
title = {On the scattering theory of the Laplacian with a periodic boundary condition. I. Existence of wave operators.},
journal = {Documenta Mathematica},
volume = {8},
year = {2003},
pages = {547-565},
zbl = {1142.35374},
language = {en},
url = {http://dml.mathdoc.fr/item/02028922}
}
Frank, Rupert L. On the scattering theory of the Laplacian with a periodic boundary condition. I. Existence of wave operators.. Documenta Mathematica, Tome 8 (2003) pp. 547-565. http://gdmltest.u-ga.fr/item/02028922/