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
Dörfler, Willibald: Automorphismen von $X$-Summen von Graphen. (German) [Automorphisms of $X$-sums of graphs]. Czechoslovak Mathematical Journal, vol. 22 (1972), issue 4, pp. 581-589

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