@article{patty2023spacelike,
  author = "V. Patty",
  title = "Spacelike surfaces in Minkowski 4-space with a canonical normal null direction",
  year = 2023,
  journal = "Revista Boliviana de Matemática",
  publisher = "Instituto de Investigación Matemática - Universidad Mayor de San Andrés",
  volume = 2,
  institution = "Universidad Mayor de San Andrés",
  number = 2,
  pages = "97-115",
  month = "Nov",
  keywords = "spacelike surfaces, minkowski space, canonical normal null direction, asymptotic direction",
  url = "https://revbolmat.fcpn.edu.bo/wp-content/uploads/2023/12/RevBolMat_Vol2_No2_On_line.pdf",
  isbn = "2957-8604"
}