@article{oai:soar-ir.repo.nii.ac.jp:00011915,
 author = {Kawamura,  Y},
 issue = {2},
 journal = {PROGRESS OF THEORETICAL PHYSICS},
 month = {Feb},
 pages = {289--297},
 title = {Topological Grand Unification},
 volume = {121},
 year = {2009}
}