Reference for “PNG (Portable Network Graphics) Specification”

@TechReport{Lane:96:PNG,
  author      = "Tom Lane and Thomas Boutell",
  title       = "{PNG} (Portable Network Graphics) Specification",
  month       = oct,
  note        = "http://www.w3.org/TR/REC-png-961001",
  year        = "1996",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "first Edition of a Recommendation",
  institution = "W3C",
}