@TechReport{NorrishVestergaard:DiagramTR:2006,
  author =       {Michael Norrish and Ren\'e Vestergaard},
  title =        {Structural Preservation and Reflection of Diagrams},
  institution =  {National ICT Australia~(NICTA)},
  year =         2006,
  number =       {PA006140},
  note =         {Also available as JAIST Technical Report~IS-RR-2006-011.}
}