El diámetro de ciertos digrafos circulantes de triple paso.
This paper studies some diameter-related properties of the 3-step circulant digraphs with set of vertices V≡Z and steps (± a,b). More precisely, it concentrates upon maximizing their order N for any fixed value of their diameter k. In the proposed geometrical approach, each digraph is fully represented by a T-shape tile which tessellates periodically the plane. The study of these tiles leads to the optimal solutions.