Bo-Qing Dong Zhi-Min Chen Remarks on upper and lower bounds of solutions to the Navier-Stokes equations in R<sup>2</sup>. 553-558 2006 182 Appl. Math. Comput. 1 https://doi.org/10.1016/j.amc.2006.04.017 db/journals/amc/amc182.html#DongC06a