@article{oai:ritsumei.repo.nii.ac.jp:00001754,
 author = {PENG, Virginia},
 issue = {6},
 journal = {立命館経済学, 立命館経済学},
 month = {Mar},
 pages = {787--801},
 title = {The basis of language change},
 volume = {60},
 year = {2012}
}