(Nov. 2007)==External links==* Abstract, Are Q-stars a serious threat for stellar-mass black hole candidates?, Miller J.C., Shahbaz T., Nolan L.A, 1997* Abstract, No observational proof of the black-hole event-horizon, Marek A. Abramowicz, Wlodek Kluzniak, Jean-Pierre Lasota, 2002* New Scientist issue 2643, "Could preon stars reveal a hidden reality?
(Nov. 2007)* Abstract, Are Q-stars a serious threat for stellar-mass black hole candidates?, Miller J.C., Shahbaz T., Nolan L.A, 1997* Abstract, No observational proof of the black-hole event-horizon, Marek A. Abramowicz, Wlodek Kluzniak, Jean-Pierre Lasota, 2002* New Scientist issue 2643, «Could preon stars reveal a hidden reality?», 6 February 2008* New Scientist issue 2472, «Micro-stars may manage to avoid black-hole fate», 6 November 2008