@article{AHL_2021__4__685_0,
     author = {Bestvina, Mladen and Bromberg, Ken and Fujiwara, Koji},
     title = {Proper actions on finite products of quasi-trees},
     journal = {Annales Henri Lebesgue},
     pages = {685--709},
     publisher = {\'ENS Rennes},
     volume = {4},
     year = {2021},
     doi = {10.5802/ahl.85},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/ahl.85/}
}