@techreport {TR-1986-009,
   type = {Technical Report},
   author = {John Conery },
   title = {Backward Execution in Nondeterministic AND-Parallel Systems },
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1986-009,
   month = 10,
   year = 1986,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1986-009.pdf}},
}