An elementary proof of uniqueness of the particle trajectories for   solutions of a class of shear-thinning non-Newtonian 2D fluids
  We prove some regularity results for a class of two dimensional non-Newtonian fluids. By applying results from [Dashti and Robinson, Nonlinearity, 22 (2009), 735-746] we can then show uniqueness of particle trajectories. 
Luigi C. Berselli and Luca Bisconti
math.AP