@techreport {TR-1993-013,
   type = {Technical Report},
   author = {K. Freeman, A. Farley},
   title = {Toward Formalizing Dialectical Argumentation},
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1993-013,
   month = 5,
   year = 1993,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1993-013.pdf}},
}