@techreport{Nakano2003, 
     address = "Japan", 
     author = "Nakano, Shin-ichi and Uno, Takeaki", 
     institution = "National Institute for Infomatics", 
     link = "http://www.nii.ac.jp/TechReports/03-005E.pdf", 
     number = "Tech. Rep. NII-2003-005E", 
     title = "Efficient generation of rooted trees", 
     uri = "http://www.nii.ac.jp/TechReports/03-005E.pdf", 
     year = "2003", 
     zzzdoi = "MY/Nakano_Uno_2003_NIItech", 
}

Problems: 154