TY - BOOK AU - Aczel,Peter AU - Simmons,Harold AU - Wainer,Stanley S. TI - Proof theory: a selection of papers from the Leeds Proof Theory Programme 1990 SN - 9780521054164 AV - QA9.54 .P76 1992 PY - 2008/// CY - Cambridge PB - Cambridge University Press KW - Proof theory ER -