1.      Rui A. C. Ferreira and Delfim F. M. Torres. Remarks on the Calculus of Variations on Time Scales, Int. J. Ecol. Econ. Stat., Vol. 9, Nr. F07, 2007, pp. 65-73.

2.      Rui A. C. Ferreira and Delfim F. M. Torres. Higher Order Calculus of Variations on Time Scales. Mathematical Control Theory and Finance, Springer, 2008, pp. 149-159.

3.      Moulay Rchid Sidi Ammi, Rui A. C. Ferreira, and Delfim F. M. Torres, Diamond-alpha Jensen's Inequality on Time Scales, Journal of Inequalities and Applications, vol. 2008, Article ID 576876, 13 pages, 2008. doi:10.1155/2008/576876.

4.      Rui A. C. Ferreira and Delfim F. M. Torres. Generalizations of Gronwall-Bihari Inequalities on Time Scales. Journal of Difference Equations and Applications, 15 (2009), nr. 06, 529-539.

5.      Rui A. C. Ferreira, Moulay Rchid Sidi Ammi, Delfim F. M. Torres. Diamond-alpha Integral Inequalities on Time Scales, Int. J. Math. Stat. 5 (2009), No. A09, 52-59.

6.      Rui A. C. Ferreira and Delfim F. M. Torres. Generalized Retarded Integral Inequalities. Applied Mathematics Letters, vol. 22 (2009) 876-881.

7.      Rui A. C. Ferreira and Delfim F. M. Torres. Some linear and nonlinear integral inequalities on time scales in two independent variables. Nonlinear Dynamics and Systems Theory, 9(2) (2009) 161-169.

8.      Rui A. C. Ferreira. Constantin Integral Inequalities on time scales. Archiv Der Mathematik, Volume 93, Issue 2 (2009), 153-163.

9.      Rui A. C. Ferreira. Existence of solutions to some retarded integrodifferential equations via the Topological Transversality Theorem. Nonlinear Analysis, 72 (2010), pp. 3062-3068. doi: 10.1016/j.na.2009.11.045.