@article{oai:tsukuba.repo.nii.ac.jp:00007243,
 author = {Tanaka, Kazuhiko},
 journal = {Tsukuba English Studies},
 month = {Aug},
 pages = {83--95},
 title = {Do we really need reference time in the description of the tense ?},
 volume = {10},
 year = {1991}
}