@unpublished{DenkKrainer2009,
  author  = {Robert Denk and Thomas Krainer},
  title   = {R-Boundedness, pseudodifferential operators, and maximal regularity for some classes of partial differential operators},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(2006) 14},
  year    = {2009},
}