Bridges and Hamiltonian circuits in planar graphs.
On a pair of functional equations of combinatorial interest.
On the Enumeration of Two-Coloured, Rooted and Weighted Plane Trees. (Short Communication).
On the Enumeration of Two-Colured, Rooted and Weighted Plane Trees.
Mediations on the product rule.
Chromatic sums revisited.
Τι είναι τα Μαθηματικά
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