Fixing the erroneous sorting on ``van''
@PREAMBLE{"\providecommand{\noopsort}[1]{}"} 

@Mastersthesis{Gijzelthesis,
	author = {{\noopsort{Gijzel}}van Gijzel, Bas},
	title  = {Relating proof standards and abstract argumentation},
	year = {2011},
	school = {Utrecht University},
	month = {June}	
}