@article{10_4171_ggd_630,
     author = {Michael Bj\"orklund and Alexander Fish and James Parkinson},
     title = {Patterns in sets of positive density in trees and affine buildings},
     journal = {Groups, geometry, and dynamics},
     pages = {1267--1295},
     year = {2021},
     volume = {15},
     number = {4},
     doi = {10.4171/ggd/630},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/630/}
}