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[1] F. Harary R. Z. Norman D. Cartwright: Structural Models: Аn Introduction to the Theoгy of Directed Graphs. John Wiley&Sons, Inc, 1965. MR 0184874
[2] P. Komárek: Some New Good Characterizations for Directed Graphs. Čas. pěst. mat. 109 (1984), 348-354. MR 0774277
[3] J. Nesetřil: Theory of Graphs. (Czech), Praha, SNTL (1979).
[4] J. Nešetřil A. Pultr: On Classes of Graphs Determined by Factoг Objects and Subobjects. Discrete Math. 22 (1978), s. 287-300. MR 0522724
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