The differential on graph operator R(G). - Ludwin A. Basilio; Jesús Leaños Macías; Omar Rosario Cayetano; José María Sigarreta Almira (RAIRO Oper. Res., 2024)

On the differential in central operator 𝒞( G ). - Jair Castro Simón; Jesús Leaños Macías; Omar Rosario Cayetano; José María Sigarreta Almira (RAIRO Oper. Res., 2026)