@article{Knuth1979, 
     author = "Knuth, Donald E", 
     doi = "10.1016/0166-218X(79)90018-0", 
     issn = "0166218X", 
     journal = "Discrete Applied Mathematics", 
     link = "http://www.sciencedirect.com/science/article/pii/0166218X79900180 http://linkinghub.elsevier.com/retrieve/pii/0166218X79900180", 
     month = "sep", 
     number = "1-2", 
     pages = "117--125", 
     title = "Lexicographic permutations with restrictions", 
     uri = "http://www.sciencedirect.com/science/article/pii/0166218X79900180", 
     volume = "1", 
     year = "1979", 
}

Problems: 385