On finite time blowup for mass-critical Hartree equations
  We consider the fractional Schr\"odinger equations with focusing Hartree type nonlinearity. When the energy is negative, we use a Glassey's virial type argument to show the finite time blow-up of solutions. 
Yonggeun Cho, Gyeongha Hwang, Soonsik Kwon and Sanghyuk Lee
math.AP