Geodesic
A note on kernels and solutions in digraphs
Discussiones Mathematicae. Graph Theory, Tome 19 (1999) no. 2, pp. 237-240

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For given nonnegative integers k,s an upper bound on the minimum number of vertices of a strongly connected digraph with exactly k kernels and s solutions is presented.
Keywords: kernel of digraph, solution of digraph 
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Harminc, Matúš; Soták, Roman. A note on kernels and solutions in digraphs. Discussiones Mathematicae. Graph Theory, Tome 19 (1999) no. 2, pp. 237-240. http://geodesic.mathdoc.fr/item/DMGT_1999_19_2_a9/