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References:
[1] J. Sedláček: Kombinatoгika v teoгii a praxi. Úvod do teorie grafů. Praha 1964. (Geгman translation: Einführung in die Graphentheoгie. Leipzig 1968.)
[2] B. Zelinka: Alternating connectivity of digraphs. Čas. pӗst. mat. (to appear). MR 0285453 | Zbl 0248.05126
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