@article{10_1090_S0894_0347_2013_00771_7,
     author = {Rudelson, Mark and Vershynin, Roman},
     title = {Invertibility of random matrices: {Unitary} and orthogonal perturbations},
     journal = {Journal of the American Mathematical Society},
     pages = {293--338},
     year = {2014},
     volume = {27},
     number = {2},
     doi = {10.1090/S0894-0347-2013-00771-7},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-2013-00771-7/}
}