Local Realizability Toposes and a Modal Logic for Computability.

Steven Awodey Lars Birkedal Dana S. Scott Local Realizability Toposes and a Modal Logic for Computability. 1999 23 Electr. Notes Theor. Comput. Sci. 1 http://www.elsevier.com/gej-ng/31/29/23/92/27/show/Products/notes/index.htt#004 db/journals/entcs/entcs23.html#AwodeyBS99