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Polster, Burkhard A sufficient condition for planar partition functions. (English) Zbl 0924.51002 Arch. Math. 65, No. 2, 176-184 (1995). MSC: 51A05 26B05 PDFBibTeX XMLCite \textit{B. Polster}, Arch. Math. 65, No. 2, 176--184 (1995; Zbl 0924.51002) Full Text: DOI