On the centre of gravity and width of lattice-constrained convex sets in the plane. Hernández Cifre, M.A.; Scott, P.R.; Segura Gomis, S. — 1997 Beiträge zur Algebra und Geometrie
Notes on the roots of Steiner polynomials. M. Henk; M.Á. Hernández-Cifre — 2008 Revista Matemática Iberoamericana