@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040093,
 author = {Sasahira, Hirofumi},
 issue = {2},
 journal = {Journal of mathematical sciences, the University of Tokyo},
 month = {Oct},
 note = {application/pdf},
 pages = {257--289},
 title = {An SO(3)-version of 2-torsion instanton invariants},
 volume = {15},
 year = {2008}
}