Author: Harary, Frank

Akiyama, Jin; Exoo, Geoffrey; Harary, Frank: Covering and packing in graphs. III: Cyclic and acyclic invariants. (English). Mathematica Slovaca, vol. 30 (1980), issue 4, pp. 405-417
Dörfler, Willibald; Harary, Frank; Malle, Günther: Covers of digraphs. (English). Mathematica Slovaca, vol. 30 (1980), issue 3, pp. 269-280

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