CASIMIRO, Ana; RODRIGO, C. Reduction of Forward Difference Operators in Principal G-bundles. Statistics, Optimization & Information Computing, [S. l.], v. 6, n. 1, p. 42–85, 2018. DOI: 10.19139/soic.v6i1.468. Disponível em: https://iapress.org/index.php/soic/article/view/soic.20180305. Acesso em: 8 may. 2026.