Introduced transition state concept independent from Slater 

Developed LDA-1/2, a new methodology for obtaining excited states of a crystal

OTHER CONTRIBUTIONS

With C.J.A. Quadros. Fourier method of analysis of magneto-oscillatory effects. Phys. Lett. A 28(3):211-2, 1968  

A Local Approximation for Exchange and Correlation in Band Structure Calculations. Journal of Physics and Chemistry of Solids 30:1113, 1969

With J.R. Leite & J.R. Pereira. A correlation to the Liberman approximation for the exchange energy. Appl. Phys. Lett. 40 A: 315, 1972

With J. R. Pereira Neto, D. Lida & A. Agostinho Neto. Generalization of the Augmented Plane Wave Method. Journal Of Physics C 7:1076, 1974.

With A. Agostinho Neto & D. Lida. A Non-Muffin-Tin Version of the Multiple-Scattering Method for Crystals and Molecules. Physical Review B 14:354, 1976.

With S.R. Salinas & M.J. Oliveira. On a Variational Procedure for Obtaining the Thermodynamic Properties of Statistical Models. Physica Status Solidi B - Basic Research 83:229, 1977.

With P.S. Guimarães & N.J. Parada. Improved Effective Mass Approximation for Impurity Levels in Insulators. Solid State Communications 27:137, 1978.

With J.R. Leite. General Formulation of the Variational Cellular Method for Molecules and Crystals. Physical Review A  18:335, 1978

With L.M. Brescansin. A Crystalline Cluster Model for Ionic Solids: NaCl. Physical Review B 20: 3415, 1979

With P.S. Guimarães. A method to estimate the relativistic corrections in Atomic and Molecular Calculations. Solid State Communications. 32:525, 1979

Theory and Method for Accelerating the Convergence of Self-Consistent Electronic Structure Calculations. Journal of Computational Physics 36:198, 1980.

With M. A. A. Pudensi. A Method to Calculate the Reflection and Transmission of Guided Waves. J Opt Soc Am 72:126, 1982.

With M. L. Siqueira. A New Version of the Variational Cellular Method for Polyatomic Systems. Journal of Physics B - Atomic Molecular and Optical Physics 16: 3111-3123, 1983.

With M. L. Siqueira. New Technique in the Calculation of Defects in Solids by Molecular Methods: Pure and Cu-doped ZnS. Physical Review B 34:5315-5319, 1986.

With M.A. Boselli. A model for relaxation in intermetallic compounds. Journal of Physics Condensed Matter 9:4801-4812, 1997

With V. Ozolins & A. Zunger. A new force field for alloys: application to Cu-Au (1998)

With A.R. Lopes, M.A.P. Lima & M.H.F. Bettega. A geometrical optics model for electron-molecule collisions. Journal of Physics. B, Atomic, Molecular and Optical Physics 39:1045-1053, 2006