@article{article7e57e0a2,
title   = {Singular 4-webs of asymptotic lines of spacelike surfaces in de sitter 5-space},
author = {Kasedou, Masaki and Nabarro, Ana Claudia and Ruas, Maria Aparecida Soares},
year = {2020},
doi = {10.1007/s00574-019-00153-0},
journal   = {Bulletin of the Brazilian Mathematical Society : New Series}
}