@article{10_4007_annals_2015_181_3_6,
     author = {Qi'an Guan and Xiangyu Zhou},
     title = {A solution of an $L^{2}$ extension problem with an optimal estimate and applications},
     journal = {Annals of mathematics},
     pages = {1139--1208},
     publisher = {mathdoc},
     volume = {181},
     number = {3},
     year = {2015},
     doi = {10.4007/annals.2015.181.3.6},
     mrnumber = {3296822},
     zbl = {06446410},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2015.181.3.6/}
}