@techreport {TR-1990-011,
   type = {Technical Report},
   author = {John Anderson, Art Farley},
   title = {Incremental Selection in  Plan Composition },
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1990-011,
   year = 1990,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1990-011.pdf}},
}