@article{Xiang1997, 
     author = "Xiang, L.", 
     doi = "10.1093/comjnl/40.5.278", 
     issn = "0010-4620", 
     journal = "The Computer Journal", 
     link = "http://comjnl.oupjournals.org/cgi/doi/10.1093/comjnl/40.5.278", 
     month = "may", 
     number = "5", 
     pages = "278--291", 
     title = "Grammar-Oriented Enumeration of Binary Trees", 
     uri = "http://comjnl.oupjournals.org/cgi/doi/10.1093/comjnl/40.5.278", 
     volume = "40", 
     year = "1997", 
}

Problems: 318