@article{oai:repository.dl.itc.u-tokyo.ac.jp:00039152,
 author = {Miyama, Mioko},
 journal = {Linguistic research : working papers in English linguistics},
 month = {Dec},
 pages = {41--61},
 title = {Da and the Zero Form as the Two Contracted Forms of the Japanese Copula},
 volume = {27},
 year = {2011}
}