@article{oai:jaxa.repo.nii.ac.jp:00026777,
 author = {土明, 正勝 and 折戸, 周治 and 吉田, 哲也 and 蓑輪, 眞 and Tsuchiaki, Masakatsu and Orito, Shuji and Yoshida, Tetsuya and Minowa, Makoto},
 issue = {1},
 journal = {Physics Letters B},
 month = {Feb},
 note = {資料番号: SA1003479000},
 pages = {81--85},
 title = {Search for Neutral Boson in Orthopositronium Decay},
 volume = {236},
 year = {1990}
}