@article{Zaks1980, 
     author = "Zaks, Shmuel", 
     doi = "10.1016/0304-3975(80)90073-0", 
     issn = "03043975", 
     journal = "Theoretical Computer Science", 
     link = "http://www.sciencedirect.com/science/article/pii/0304397580900730", 
     month = "jan", 
     number = "1", 
     pages = "63--82", 
     title = "Lexicographic generation of ordered trees", 
     uri = "http://www.sciencedirect.com/science/article/pii/0304397580900730", 
     volume = "10", 
     year = "1980", 
}

Problems: 384