@article{oai:repository.dl.itc.u-tokyo.ac.jp:00041006,
 author = {Kato, Keiichi},
 journal = {Scientific papers of the College of Arts and Sciences, the University of Tokyo},
 month = {},
 note = {application/pdf},
 pages = {131--139},
 title = {Interaction of Singularities of Solution to Semilinear Wave Equation at the Boundary},
 volume = {38},
 year = {1988}
}