<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Bárány, Vince / Benedikt, Michael / ten Cate, Balder</hi> (2013): "Rewriting guarded negation queries", in: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Mathematical Foundations of Computer Science 2013 (MFCS 2013)</hi>, volume 8087 of LNCS. Berlin / Heidelberg / New York: Springer 89-110.