@incollection {SarkisICASE,
  AUTHOR = {Cai, Xiao-Chuan  and Farhat, Charbel and Sarkis, Marcus},
  TITLE = {Variable degree {S}chwarz methods for implicit solution of unsteady
compressible {N}avier-{S}tokes equations on two-dimensional unstructured meshes},
   booktitle = {ICASE Report No. 96-48},
publisher =  {NASA Langley Research Center}, 
  YEAR = {1996},
}