Lines of curvature, ridges and conformal invariants of hypersurfaces. Romero-Fuster, M.C.; Sanabria-Codesal, E. — 2004 Beiträge zur Algebra und Geometrie
A lower estimate for the number of zero-torsion points of a space curve. Romero-Fuster, M.C.; Sedykh, V.D. — 1997 Beiträge zur Algebra und Geometrie
Fold maps from the sphere to the plane. Hacon, D.; Mendes de Jesus, C.; Romero Fuster, M.C. — 2006 Experimental Mathematics