@phdthesis{oai:nagoya.repo.nii.ac.jp:00029592,
 author = {NISHIDA, Yuka and 西田, 由佳},
 month = {Mar},
 school = {名古屋大学, Nagoya University},
 title = {Gravitational wave background from cosmic strings and cosmic superstrings},
 year = {2020}
}