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[1] F. Harary R. Z. Norman D. Cartwright: Structural Models: an introduction to the theory of directed graphs. Wiley, New York, 1965. MR 0184874
[2] F. Harary: Graph Theory. Addison-Wesley, Reading (Mass.) 1969. MR 0256911 | Zbl 0196.27202
[3] P. Horák: A note on removing a point of a strong digraph. Math. Slovaca (to appear). MR 0689283
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