@article{SLC_2018_80B_a22,
     author = {Pavel Galashin and Steven N. Karp and Thomas Lam},
     title = {The {Totally} {Nonnegative} {Grassmannian} is a {Ball}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {2018},
     volume = {80B},
     url = {http://geodesic.mathdoc.fr/item/SLC_2018_80B_a22/}
}