Grzegorz Herman Tim Paterson Michael Soltys A Propositional Proof System with Quantification Over Permutations. 71-83 2007 79 Fundam. Inform. 1-2 http://iospress.metapress.com/openurl.asp?genre=article&issn=0169-2968&volume=79&issue=1&spage=71 db/journals/fuin/fuin79.html#HermanPS07