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Author: Dörfler, Willibald

• Dörfler, Willibald; Harary, Frank; Malle, Günther: Covers of digraphs. (English). Mathematica Slovaca, vol. 30 (1980), issue 3, pp. 269-280
• Dörfler, Willibald: On mapping graphs and permutation graphs. (English). Mathematica Slovaca, vol. 28 (1978), issue 3, pp. 277-288