@article{oai:kanazawa-u.repo.nii.ac.jp:00010102,
 author = {Ito, K. R. and Tamura, Hiroshi},
 issue = {1},
 journal = {Communications in Mathematical Physics},
 month = {Apr},
 note = {We investigate critical temperature of the classical O(N) spin model in two dimensions. We show that if N is large and there is a phase transition in the system, the critical inverse temperature gc obeys the bound gc(N)> const. N log N.},
 pages = {127--168},
 title = {N dependence of upper bounds of critical temperatures of 2D O(N) spin models},
 volume = {202},
 year = {1999}
}