@article{oai:repository.dl.itc.u-tokyo.ac.jp:00039732, author = {Yajima, Kenji}, issue = {3}, journal = {Journal of the Faculty of Science, the University of Tokyo. Sect. 1 A, Mathematics = 東京大学理学部紀要. 第1類A, 数学}, month = {Dec}, note = {application/pdf}, pages = {517--523}, title = {Nonrelativistic limit of the Dirac theory, scattering theory}, volume = {23}, year = {1976} }