@incollection {MR1911969,
    AUTHOR = {Sarkis, Marcus},
     TITLE = {Partition of unity coarse spaces},
 BOOKTITLE = {Fluid flow and transport in porous media: mathematical and
              numerical treatment ({S}outh {H}adley, {MA}, 2001)},
    SERIES = {Contemp. Math.},
    VOLUME = {295},
     PAGES = {445--456},
 PUBLISHER = {Amer. Math. Soc.},
   ADDRESS = {Providence, RI},
      YEAR = {2002},
   MRCLASS = {65N55},
  MRNUMBER = {1911969 (2003e:65234)},
}