@article{MZ_1968__108_171107,
     author = {Abraham Karrass and Donald Solitar},
     title = {On the {Failure} of the {Howson} {Property} for a {Group} with a {Single} {Defining} {Relation.}},
     journal = {Mathematische Zeitschrift},
     pages = {235--236},
     publisher = {mathdoc},
     volume = {108},
     year = {1968},
     zbl = {0182.03403},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__108_171107/}
}