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Published 18 Jan 2011
John Raedts & Servé W. M. Kengen & John van der Oost
Received: 13 December 2010 / Revised: 14 January 2011 / Accepted: 18 January 2011 / Published online: 24 February 2011. The Author(s) 2011. This article is published with open access at Springerlink.com