This article is not available in post-print (final draft version) until October 2008.

If you wish to obtain a copy of the paper please contact Professor Gobet at fernand.gobet@brunel.ac.uk


Publisher:  	Verlag Hans Huber
Pre-print:	author can archive pre-print (ie pre-refereeing)
Post-print:	subject to Restrictions below, author can archive post-print (ie final draft post-refereeing)

Restrictions:	

* 12 month embargo