Compact cores of coverings

@inproceedings{Clifford1999CompactCO,
  title={Compact cores of coverings},
  author={Andrew Clifford},
  year={1999}
}
Abstract Let H be a subgroup of G . In this paper we discuss the following questions: Is there a two-complex L so that π 1 (L)=G and so that the cover of L corresponding to H has a compact core? Is there an L so that π 1 (L)=G and so that the cover of L corresponding to H doesn't have a compact core?