@article{oai:tsukuba.repo.nii.ac.jp:00015748,
 author = {Iwashita, Hirokazu},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {337--354},
 title = {Spectal representation and asymptotic wave functions for long-range perturbations of the d'Alembert equation},
 volume = {7},
 year = {1983}
}