@article{article01820db7,
title   = {Singularities of 3-parameter line congruences in R⁴},
author = {Lopes, Débora and Ruas, Maria Aparecida Soares and Santos, Igor Chagas},
year = {2023},
doi = {10.1017/prm.2022.41},
journal   = {Proceedings of the Royal Society of Edinburgh}
}