@article{10_4153_S0008414X19000385,
     author = {Mihalik, Michael L.},
     title = {Bounded {Depth} {Ascending} {HNN} {Extensions} and $\unicode[STIX]{x1D70B}_{1}${-Semistability} at infinity},
     journal = {Canadian journal of mathematics},
     pages = {1529--1550},
     year = {2020},
     volume = {72},
     number = {6},
     doi = {10.4153/S0008414X19000385},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008414X19000385/}
}