@article{10_4153_S000843951900064X,
     author = {Jardine, J. F.},
     title = {Stable {Components} and {Layers}},
     journal = {Canadian mathematical bulletin},
     pages = {562--576},
     year = {2020},
     volume = {63},
     number = {3},
     doi = {10.4153/S000843951900064X},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S000843951900064X/}
}