Gräter, M., & Wetterich, C. (1994). Kosterlitz-Thouless phase transition in the two dimensional linear sigma model. Arxiv.
Chicago Style (17th ed.) CitationGräter, Marcus, and Christof Wetterich. "Kosterlitz-Thouless Phase Transition in the Two Dimensional Linear Sigma Model." Arxiv 1994.
MLA (9th ed.) CitationGräter, Marcus, and Christof Wetterich. "Kosterlitz-Thouless Phase Transition in the Two Dimensional Linear Sigma Model." Arxiv, 1994.
Warning: These citations may not always be 100% accurate.