@article{BMMS_2008_31_1_a2,
     author = {P. C. Wong and K. B. Wong},
     title = {Subgroup {Separability} and {Conjugacy} {Separability} of {Certain
}                            {HNN} {Extensions}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2008},
     volume = {31},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2008_31_1_a2/}
}