@techreport {TR-1996-007,
   type = {Technical Report},
   author = {Zena M. Ariola, Matthias Felleisen},
   title = {The Call-By-Need Lambda Calculus},
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1996-007,
   month = 4,
   year = 1996,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1996-007.pdf}},
}