%0 Journal Article %A Laurent Clozel %T Presentation of an Iwasawa algebra: the case of $\Gamma_1{SL}(2,\Bbb Z_p)$ %J Documenta mathematica %D 2011 %P 545-559 %V 16 %U http://geodesic.mathdoc.fr/articles/10.4171/dm/341/ %R 10.4171/dm/341 %F 10_4171_dm_341