@article{oai:kansaigaidai.repo.nii.ac.jp:00005939,
 author = {平田, 裕 and Hirata, Yu},
 journal = {関西外国語大学留学生別科日本語教育論集, Papers in Teaching Japanese as a Foreign Language},
 month = {},
 pages = {43--59},
 title = {Overuse/underuse of wa and ga in learner's spoken Japanese : Reconsideration of error ratios and pedagogical implications},
 volume = {11},
 year = {2001},
 yomi = {ヒラタ, ユウ}
}