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References:
[1] F. Zítek: Polarisované grafy. (Polarized graphs.) Lecture at the Conference on Graph Theory held at Štiřín in May 1972.
[2] B. Zelinka: Isomorphismus of polar and polarized graphs. Czech. Math. J. 26(101), (1976), 339-351. MR 0498288
[3] B. Zelinka: Analoga of Menger's Theorem for polar and polarized graphs. Czech. Math. J. 26 (101), (1976), 352-360. MR 0498289 | Zbl 0341.05122
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