@article{10_1017_fms_2023_107,
     author = {Rune Haugseng and Fabian Hebestreit and Sil Linskens and Joost Nuiten},
     title = {Two-variable fibrations, factorisation systems and $\infty $-categories of spans},
     journal = {Forum of Mathematics, Sigma},
     publisher = {mathdoc},
     volume = {11},
     year = {2023},
     doi = {10.1017/fms.2023.107},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/fms.2023.107/}
}