@article{oai:u-ryukyu.repo.nii.ac.jp:02005319,
 author = {Matsumoto, Shuichi and 松本, 修一},
 journal = {Ryukyu mathematical journal},
 month = {Dec},
 note = {We formulate some fluctuations of space-time which do not generate any fluctuations in the curvature, but which nevertheless do give rise to a spontaneous breakdown of the quantum superposition principle for macroscopic objects., 紀要論文},
 pages = {65--73},
 title = {On a minimum uncertainty of space-time geometry},
 volume = {10},
 year = {1997}
}