Note on a sufficient condition for a local minimum of a class of nonconvex quadratic programs. - Susana Scheimberg; Patricia Erthal de Moraes (Math. Program., 1998)

The Fifth and Sixth Coefficients of the Characteristic Polynomial of a Graph. - Patricia Erthal de Moraes; Nair Maria Maia de Abreu; Samuel Jurkiewicz (Electron. Notes Discret. Math., 2002)