@techreport {TR-1990-005,
   type = {Technical Report},
   author = {Keith Downing, Stephen Fickas },
   title = {Specification Criticism  via Policy-Directed Envisionment},
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1990-005,
   month = 2,
   year = 1990,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1990-005.pdf}},
}