@article{oai:tsukuba.repo.nii.ac.jp:00007515,
 author = {Iwasaki, Y. and 岩崎, 洋一},
 issue = {11},
 journal = {Physical review letters},
 month = {Sep},
 pages = {754--756},
 title = {Instanton Contributions in Two-Dimensional Nonlinear O(3) σ Model},
 volume = {47},
 year = {1981}
}