@article{Schultz1982, 
     author = "Schultz, Phillip", 
     doi = "10.1016/0012-365X(82)90207-2", 
     issn = "0012365X", 
     journal = "Discrete Mathematics", 
     link = "http://www.sciencedirect.com/science/article/pii/0012365X82902072 http://linkinghub.elsevier.com/retrieve/pii/0012365X82902072", 
     month = "jan", 
     number = "2", 
     pages = "199--214", 
     title = "Enumerations of rooted trees with an application to group presentations", 
     uri = "http://www.sciencedirect.com/science/article/pii/0012365X82902072", 
     volume = "41", 
     year = "1982", 
}

Problems: 443