Philipp Gerhardy Ulrich Kohlenbach Generalized metatheorems on the extractability of uniform bounds in functional analysis. 2005 conf/dagstuhl/2005P5021 Mathematics, Algorithms, Proofs http://drops.dagstuhl.de/opus/volltexte/2006/431 db/conf/dagstuhl/P5021.html#GerhardyK05