@article{Er1983, 
     author = "Er, M. C.", 
     doi = "10.1093/comjnl/26.3.205", 
     issn = "0010-4620", 
     journal = "The Computer Journal", 
     link = "http://comjnl.oupjournals.org/cgi/doi/10.1093/comjnl/26.3.205", 
     month = "mar", 
     number = "3", 
     pages = "205--207", 
     title = "A Note on Generating Well-Formed Parenthesis Strings Lexicographically", 
     uri = "http://comjnl.oupjournals.org/cgi/doi/10.1093/comjnl/26.3.205", 
     volume = "26", 
     year = "1983", 
}

Problems: 372