@article{10_4007_annals_2010_172_187,
     author = {Igor Rodnianski and Jacob Sterbenz},
     title = {On the formation of singularities in the critical $O(3)$ $\sigma$-model},
     journal = {Annals of mathematics},
     pages = {187--242},
     publisher = {mathdoc},
     volume = {172},
     number = {1},
     year = {2010},
     doi = {10.4007/annals.2010.172.187},
     mrnumber = {2680419},
     zbl = {1213.35392},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2010.172.187/}
}