Christophe Raffalli Frédéric Ruyer Realizability of the Axiom of Choice in HOL. (An Analysis of Krivine's Work). 241-258 2008 84 Fundam. Inform. 2 http://iospress.metapress.com/content/p42t516652154205/ db/journals/fuin/fuin84.html#RaffalliR08