@article{oai:tsukuba.repo.nii.ac.jp:00032220,
 author = {Wada, Naoaki},
 journal = {Tsukuba English Studies},
 month = {Oct},
 pages = {29--70},
 title = {A Unified Model of Tense and Modality and the Three-Tier Model of Language Use (Part I: Papers on the Three-Tier Model of Language Use)},
 volume = {32},
 year = {2013}
}