@article{Knop1981, 
     author = "Knop, J. V. and Mueller, W. R. and Jericevic, Z. and Trinajstic, N.", 
     doi = "10.1021/ci00030a009", 
     issn = "1549-9596", 
     journal = "Journal of Chemical Information and Modeling", 
     link = "http://pubs.acs.org/cgi-bin/doilookup/?10.1021/ci00030a009", 
     month = "may", 
     number = "2", 
     pages = "91--99", 
     title = "Computer enumeration and generation of trees and rooted trees", 
     uri = "http://pubs.acs.org/cgi-bin/doilookup/?10.1021/ci00030a009", 
     volume = "21", 
     year = "1981", 
}

Problems: 442