@article{GT_2022_26_1_a2,
     author = {Guirardel, Vincent and Horbez, Camille},
     title = {Boundaries of relative factor graphs and subgroup classification for automorphisms of free products},
     journal = {Geometry & topology},
     pages = {71--126},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {2022},
     url = {http://geodesic.mathdoc.fr/item/GT_2022_26_1_a2/}
}