Reference for “Protocol for Web Description Resources (POWDER): Grouping of Resources”

@TechReport{Perego:09:PWD,
  author      = "Andrea Perego and Phil Archer and Kevin Smith",
  title       = "Protocol for Web Description Resources ({POWDER}): Grouping of Resources",
  month       = sep,
  note        = "http://www.w3.org/TR/2009/REC-powder-grouping-20090901/",
  year        = "2009",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Recommendation",
  institution = "W3C",
}