@mastersthesis {MS-200006-Connamacher,
   type = {Masters Thesis},
   author = {Harold Scott Connamacher},
   title = {The Complexity of Minimizing Certain Cost Metrics for K-Source Spanning Trees},
   school = {College of Arts and Sciences, University of Oregon},
   month = 6,
   year = 2000,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/MS-200006-Connamacher.pdf}},
}