@article{oai:tsukuba.repo.nii.ac.jp:00017322,
 author = {Lucente, Sandra},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {81--107},
 title = {Nonlinear wave equation with potential},
 volume = {24},
 year = {2000}
}