@article{oai:tsukuba.repo.nii.ac.jp:00020451,
 author = {TSYGALNITSKY, Elena and ツィガルニツカヤ, エレナ},
 journal = {言語学論叢},
 month = {Dec},
 pages = {83--97},
 title = {On beliefs about difficulty in language learning and learners' factors},
 volume = {26},
 year = {2007}
}