@phdthesis{oai:nagoya.repo.nii.ac.jp:00030114,
 author = {FUJITANI, Takuya and 藤谷, 拓哉},
 month = {May},
 school = {名古屋大学, Nagoya University},
 title = {On certain central extensions associated to covering spaces},
 year = {2020}
}