@article{oai:tsukuba.repo.nii.ac.jp:00017176,
 author = {Tzvetkov, Nickolay},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {193--211},
 title = {Existence of global solutions to nonlinear massless Dirac system and wave equation with small data},
 volume = {22},
 year = {1998}
}