Toward Construction of a Corpus of English Learners' Utterances Annotated with Speaker Proficiency Profiles: Data Collection and Sample Annotation. - Yasunari Harada; Kanako Maebo; Mayumi Kawamura; Masanori Suzuki; Yoichiro Suzuki; Noriaki Kusumoto; Joji Maeno (LKR, 2008)