@article{10_4153_CMB_1999_039_4,
     author = {Kim, Goansu and Tang, C. Y.},
     title = {Cyclic {Subgroup} {Separability} of {HNN-Extensions} with {Cyclic} {Associated} {Subgroups}},
     journal = {Canadian mathematical bulletin},
     pages = {335--343},
     year = {1999},
     volume = {42},
     number = {3},
     doi = {10.4153/CMB-1999-039-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1999-039-4/}
}