@article{patty2018timelike,
author = "V. H. Patty and G. Ruiz-Hernández",
title = "Timelike surfaces in Minkowski space with a canonical null direction",
year = 2018,
journal = "Journal of Geometry",
publisher = "Springer",
volume = 109,
number = 2,
pages = "35",
doi = "https://doi.org/10.1007/s00022-018-0434-2",
url = "https://link.springer.com/article/10.1007/s00022-018-0434-2"
}