Dirac's formalism combined with complex Fourier operational matrices to solve initial and boundary value problems. - William Labecca; Osvaldo Guimarães; José Roberto C. Piqueira (Commun. Nonlinear Sci. Numer. Simul., 2014)

Generalized operational matrices and error bounds for polynomial basis. - Osvaldo Guimarães; William Labecca; José Roberto C. Piqueira (Math. Comput. Simul., 2020)

Tensor solutions in irregular domains: Eigenvalue problems. - Osvaldo Guimarães; William Labecca; José Roberto Castilho Piqueira (Math. Comput. Simul., 2021)

Solving 2nd order BVPs in planar irregular domains. - Osvaldo Guimarães; William Labecca; José Roberto Castilho Piqueira (Math. Comput. Simul., 2022)