@techreport {TR-1987-007,
   type = {Technical Report},
   author = {Arthur M. Farley, Andrzej Proskurowski },
   title = {Immunity to Subgraph  Failures in  Communication Networks},
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1987-007,
   month = 5,
   year = 1987,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1987-007.pdf}},
}