V. Patty. Spacelike surfaces in Minkowski 4-space with a canonical normal null direction. Revista Boliviana de Matemática, Instituto de Investigación Matemática - Universidad Mayor de San Andrés, Universidad Mayor de San Andrés, volume 2, issue 2, pages 97-115, November 2023.

V. H. Patty and G. Ruiz-Hernández. Timelike surfaces in Minkowski space with a canonical null direction. Journal of Geometry, Springer, volume 109, issue 2, pages 35, 2018.

V. H. Patty. Timelike surfaces into 4-dimensional Minkowski space via spinors. arXiv preprint arXiv:1705.00610, Cornell University, 2017.

P. Bayard, V. Patty, and F. Sánchez-Bringas. On Lorentzian surfaces in $\mathbb{R}^{2,2}$. Proceedings of the Royal Society of Edinburgh Section A: Mathematics, Royal Society of Edinburgh Scotland Foundation, volume 147, issue 1, pages 61-88, 2017.

V. Patty. A generalized Weierstrass representation of Lorentzian surfaces in $\mathbb{R}^{2,2}$ and applications. International Journal of Geometric Methods in Modern Physics, World Scientific, volume 13, issue 6, pages 1650074, 2016.

P. Bayard and V. Patty. Spinor representation of Lorentzian surfaces in $\mathbb{R}^{2,2}$. Journal of Geometry and Physics, Elsevier, volume 95, pages 74-95, 2015.