@article{oai:sapporo-u.repo.nii.ac.jp:00007439,
 author = {Kitada, Shin-Ichi},
 journal = {Phonological Externalization, Phonological Externalization},
 month = {Mar},
 pages = {63--74},
 title = {PF Intervention Conditions on Covert Pied-Piping},
 volume = {1},
 year = {2016}
}