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A note on graph coloring

D. De Werra (1974)

RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications

A remark on graph operators

Bohdan Zelinka (1999)

Mathematica Bohemica

A theorem is proved which implies affirmative answers to the problems of E. Prisner. One problem is whether there are cycles of the line graph operator L with period other than 1, the other whether there are cycles of the 4-edge graph operator 4 with period greater than 2. Then a similar theorem follows.

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