@techreport {TR-1982-003,
   type = {Technical Report},
   author = {Andrzej Proskurowski, Ekaputra Laiman },
   title = {Fast Enumeration, Ranking, and Unranking of Binary Trees},
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1982-003,
   year = 1982,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1982-003.pdf}},
}