@techreport {TR-1994-023,
   type = {Technical Report},
   author = {Sarah Douglas, Eckehard Doerry},
   title = {Cardio-Vascular Construction Kit User's Manual},
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1994-023,
   month = 11,
   year = 1994,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1994-023.pdf}},
}