@Article{JGAA-31,
   author = {{Susanne} E. {Hambrusch} and {Chuan-Ming} {Liu} and {Hyeong-Seok} {Lim}},
   title = {Clustering in Trees: Optimizing Cluster Sizes and Number of Subtrees},
   journal = {Journal of Graph Algorithms and Applications},
   year = {2000},
   volume = {4},
   number = {4},
   pages = {1--26},
   doi = {10.7155/jgaa.00031}
}