@article{JGAA_2011_15_6_a1,
     author = {Yoshio Okamoto and Yota Otachi and Ryuhei Uehara and Takeaki Uno},
     title = {Hardness {Results} and an {Exact} {Exponential} {Algorithm} for the {Spanning} {Tree} {Congestion} {Problem}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {727--751},
     publisher = {mathdoc},
     volume = {15},
     number = {6},
     year = {2011},
     doi = {10.7155/jgaa.00246},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00246/}
}