On a Certain Class of Complex Einstein Hypersurfaces in Indefinite Complex Space Forms. Alfonso Romero — 1986 Mathematische Zeitschrift
An Extension of Calabi's Rigidity theorem to complex submanifolds of indefinite complex space forms. Alfonso Romero — 1987 Manuscripta mathematica
Integral formulas for compact spacelike n-submanifolds in de Sitter spaces Applications to the parallel mean curvature vector case. Alfonso Romero; Luis J. Alías — 1995 Manuscripta mathematica
On the Gauss curvature of maximal surfaces in the 3-dimensional Lorentz-Minkowski space. Alfonso Romero; F. J.M. Estudillo — 1994 Commentarii mathematici Helvetici
Differential geometry of indefinite complex submanifolds in indefinite complex space forms. Alfonso Romero; Young Jin Suh — 2004 Extracta Mathematicae
A nonlinear inequality arising in geometry and Calabi-Bernstein type problems. Romero, Alfonso; Rubio, Rafael M. — 2010 Journal of Inequalities and Applications [electronic only]