[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