Generalized numerical ranges of permanental compounds arising from quantum systems of bosons. Bebiano, Natália; Li, Chi-Kwong; Da Providência, João — 2000 ELA. The Electronic Journal of Linear Algebra [electronic only]
Effects of quark interactions on dynamical chiral symmetry breaking by a magnetic field. Hiller, Brigitte; Osipov, Alexander A.; Blin, Alex H.; Da Providência, João — 2008 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Krein spaces numerical ranges and their computer generation. Bebiano, Natalia; da Providência, Joao; Nata, Ana Cristina; Pereira Soares, Maria da Graca — 2008 ELA. The Electronic Journal of Linear Algebra [electronic only]
Self-consistent-field method and τ -functional method on group manifold in soliton theory: a review and new results. Nishiyama, Seiya; Da Providência, João; Providência, Constança; Cordeiro, Flávio; Komatsu, Takao — 2009 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Interdependence of some problems arising in generalizing the Marcus-de Oliveira determinantal conjecture Merikoski, J.K.; Virtanen, Ari; Bebiano, Natália; Providência, João da — 1993 Portugaliae mathematica