@ARTICLE{Noack2004pf,
         AUTHOR = {Noack, B.R.\ and
                   Mezi\'c, I.\ and
                   Tadmor, G.\ and
                   Banaszuk, A.},
         YEAR   = {2004},
         TITLE  = {Optimal mixing in recirculation zones},
         JOURNAL= {Phys.\ Fluids},
         VOLUME = {16},
         NUMBER = {4},
         PAGES  = {867--888}}