Monica Visan Xiaoyi Zhang On the Blowup for the L2-Critical Focusing Nonlinear Schrödinger Equation in Higher Dimensions below the Energy Class. 34-56 2007 39 SIAM J. Math. Anal. 1 https://doi.org/10.1137/060663969 db/journals/siamma/siamma39.html#VisanZ07