TY - JOUR AU - Qi'an Guan AU - Xiangyu Zhou TI - A solution of an $L^{2}$ extension problem with an optimal estimate and applications JO - Annals of mathematics PY - 2015 SP - 1139 EP - 1208 VL - 181 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4007/annals.2015.181.3.6/ DO - 10.4007/annals.2015.181.3.6 LA - en ID - 10_4007_annals_2015_181_3_6 ER -