@techreport{BM06NASA,
  author =       "R. Butler and C. Mu{\~{n}}oz",
  title =        "An Abstract Plan Preparation Language",
  institution =  "NASA Langley",
  year =         "2006",
  type =         "Technical Memorandum",
  number =       "NASA/TM-2006-214518",
  address =      "NASA LaRC, Hampton VA 23681-2199, USA"}