@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040336,
 author = {Uchiyama, Koichi},
 issue = {1},
 journal = {Journal of mathematical sciences, the University of Tokyo},
 month = {},
 note = {application/pdf},
 pages = {199--246},
 title = {$L^2$-theory of singular perturbation of hyperbolic equations III Asymptotic expansions of dispersive type},
 volume = {3},
 year = {1996}
}