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205:"Generalizing the PetrâDouglasâNeumann Theorem on
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295:B H Neumann (1941). "Some remarks on polygons".
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181:Petr, Karel (1908). "Ein Satz Ăźber Vielecke".
142:[On a theorem for the plane polygons]
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261:"On linear polygon transformations"
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338:"Author: Petr, Karel"
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417:1950 deaths
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89:Eduard Äech
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318:Karel Petr
107:References
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168:1802-114X
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