@techreport {TR-1986-007,
   type = {Technical Report},
   author = {Stefan Arnborg, Andrzej Proakurowaki, Derek Corneil },
   title = {Forbidden Minors Characterization of Partial 3-trees },
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1986-007,
   month = 7,
   year = 1986,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1986-007.pdf}},
}