@article{Ruskey1981, 
     author = "Ruskey, Frank", 
     doi = "10.1137/0210011", 
     issn = "0097-5397", 
     journal = "SIAM Journal on Computing", 
     keyword = "1,1 subtrees were called,algorithms,in,in solving a certain,introduction,lexicographic enumeration ranking algorithm,networks,optimization problem on,ordered tree,problem of listing all,subtree,subtrees of a given,the problem originally arose,this paper studies the,tree cuts,we will also develop", 
     link = "http://epubs.siam.org/doi/abs/10.1137/0210011", 
     month = "feb", 
     number = "1", 
     pages = "141--150", 
     title = "Listing and Counting Subtrees of a Tree", 
     uri = "http://epubs.siam.org/doi/abs/10.1137/0210011", 
     volume = "10", 
     year = "1981", 
}

Problems: 3