@article{oai:kanazawa-u.repo.nii.ac.jp:00010277,
 author = {Ito, K. R. and Kugo, T. and Tamura, Hiroshi},
 issue = {3},
 journal = {Communications in Mathematical Physics},
 month = {Feb},
 note = {We establish that correlation functions of classical lattice spin models can be represented by series expansions in terms of self-avoiding random walks. Using this, we get new upper bounds of critical temperatures of the O(.V) symmetric classical Heisenberg models.},
 pages = {723--737},
 title = {Representations of O(N) spin models by self-avoiding random walks},
 volume = {183},
 year = {1997}
}