@techreport {TR-1997-004,
   type = {Technical Report},
   author = {Sergio Antoy, Zena Ariola },
   title = {Narrowing the Narrowing Space},
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1997-004,
   month = 4,
   year = 1997,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1997-004.pdf}},
}