@article{10_2307_121023,
     author = {Demetrios Christodoulou},
     title = {The instability of naked singularities in the gravitational collapse of a scalar field.},
     journal = {Annals of mathematics},
     year = {1999},
     volume = {149},
     number = {1},
     doi = {10.2307/121023},
     zbl = {1126.83305},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/121023/}
}