@article{10_4171_ggd_467,
     author = {Susan Hermiller and Conchita Mart{\'\i}nez-P\'erez},
     title = {HNN extensions and stackable groups},
     journal = {Groups, geometry, and dynamics},
     pages = {1123--1158},
     year = {2018},
     volume = {12},
     number = {3},
     doi = {10.4171/ggd/467},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/467/}
}