Fixed a bibliography entry label problem.
This was spotted by Edward d'Auvergne in a post at: https://mail.gna.org/public/relax-devel/2012-09/msg00040.html (Message-id: <CAED9pY-pvtpE69tqXqb30fj9aWL1_wU8yaM4u44rMXY1LEQbag@...>)
Authored by: semor 2012-09-05
Parent: [r17464]
Child: [r17466]
