@article{Hikita1983, 
     author = "Hikita, Teruo", 
     doi = "10.1016/0020-0190(83)90046-7", 
     issn = "00200190", 
     journal = "Information Processing Letters", 
     keyword = "Binary tree generation,inorder-preorder sequences,subtree counting,subtree listing", 
     link = "http://www.sciencedirect.com/science/article/pii/0020019083900467 http://linkinghub.elsevier.com/retrieve/pii/0020019083900467", 
     month = "nov", 
     number = "4", 
     pages = "225--229", 
     title = "Listing and counting subtrees of equal size of a binary tree", 
     uri = "http://www.sciencedirect.com/science/article/pii/0020019083900467", 
     volume = "17", 
     year = "1983", 
}

Problems: 373