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title = {{Exact Characterization of O(n) Tricriticality in Two Dimensions}},  journal = {Phys. Rev. Lett.},  }  @article{Nienhuis_2008,  doi = {10.1103/physreve.78.061104},  url = {http://dx.doi.org/10.1103/physreve.78.061104},  year = {2008},  month = {Dec},  publisher = {American Physical Society (APS)},  volume = {78},  number = {6},  author = {Bernard Nienhuis and Wenan Guo and Henk Bl\"ote},  title = {{Tricritical O(n) models in two dimensions}},  journal = {Physical Review E},  }