@article{SLC_2020-2021_82_a0,
     author = {Lo{\"\i}c Foissy and Fr\'ed\'eric Patras},
     title = {Surjections as {Double} {Posets}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {2020-2021},
     volume = {82},
     url = {http://geodesic.mathdoc.fr/item/SLC_2020-2021_82_a0/}
}