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References:

[1] J. Černý: **Applications of the graph theory in the railway traffic**. (Aplikácie teorie grafov v železničnej dopravě.) Lecture at the Conference on Graph Theory at Štiřín in May 1972.

[3] B. Zelinka: **Isomorphisms of polar and polarized graphs**. Czech. Math. J. (to appear). MR 0498288 | Zbl 0341.05121

[4] B. Zelinka: **Analoga of Menger's Theorem for polar and polarized graphs**. Czech. Math. J. (to appear). Zbl 0341.05122

[5] F. Zítek: **Polarized graphs**. (Polarisované grafy.) Lecture at the Conference on Graph Theory at Štiřín in May 1972.