TY - JOUR AU - Erez Lapid AU - Stephen Rallis TI - On the nonnegativity of $L(\frac{1}{2},\pi)$ for ${\rm SO}_{2n+1}$ JO - Annals of mathematics PY - 2003 SP - 891 EP - 917 VL - 157 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4007/annals.2003.157.891/ DO - 10.4007/annals.2003.157.891 LA - en ID - 10_4007_annals_2003_157_891 ER -