@article{Kawano2005b, 
     author = "Kawano, Shin-ichiro and Nakano, Shin-ichi", 
     doi = "10.1093/ietfec/e88-a.4.930", 
     issn = "09168508", 
     journal = "IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences", 
     keyword = "Algorithm,Enumeration,Gray code,The bell number,The stirling number of the second kind", 
     link = "http://search.ieice.org/bin/summary.php?id=e88-a_4_930\&category=A\&year=2005\&lang=E\&abst=", 
     month = "apr", 
     number = "4", 
     pages = "930--934", 
     title = "Constant time generation of set partitions", 
     uri = "http://search.ieice.org/bin/summary.php?id=e88-a_4_930&category=A&year=2005&lang=E&abst=", 
     volume = "E88-A", 
     year = "2005", 
}

Problems: 159