@article{10_4171_dm_853,
     author = {Petter Nyland and Eduard Ortega},
     title = {Matui's {AH} conjecture for graph groupoids},
     journal = {Documenta mathematica},
     pages = {1679--1727},
     year = {2021},
     volume = {26},
     doi = {10.4171/dm/853},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/853/}
}