@article{oai:barrel.repo.nii.ac.jp:00005100,
 author = {Goto, Yoshiaki and Matsumoto, Keiji},
 journal = {Nagoya Mathematical Journal},
 month = {Mar},
 pages = {61--94},
 title = {The monodromy representation and twisted period relations for Appell's hypergeometric function F4},
 volume = {217},
 year = {2015}
}