@article {GreifHocking2010,
    AUTHOR = {Greif, Chen and Hocking, Robert L.},
     TITLE = {A box-shaped cyclically reduced operator},
   JOURNAL = {Numer. Linear Algebra Appl.},
    VOLUME = {18},
      YEAR = {2011},
    NUMBER = {4},
     PAGES = {671--693}
}