@article{TAC_2020_35_a34,
     author = {Joseph Helfer},
     title = {Homotopies in {Grothendieck} fibrations},
     journal = {Theory and applications of categories},
     pages = {1312--1378},
     publisher = {mathdoc},
     volume = {35},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2020_35_a34/}
}