@article{Ruskey1992, 
     author = "Ruskey, Frank and Savage, Carla and {Min Yih Wang}, Terry", 
     doi = "10.1016/0196-6774(92)90047-G", 
     issn = "01966774", 
     journal = "Journal of Algorithms", 
     keyword = "05-04,1,68r05,68r15,ams subject classifications,cat algorithm,difference covers,fixed density,generate,introduction,lyndon words,necklaces,pii,produc-,s0097539798344112,there are many reasons,to develop algorithms for", 
     link = "http://www.sciencedirect.com/science/article/pii/019667749290047G http://linkinghub.elsevier.com/retrieve/pii/019667749290047G", 
     month = "sep", 
     number = "3", 
     pages = "414--430", 
     title = "Generating Necklaces", 
     uri = "http://www.sciencedirect.com/science/article/pii/019667749290047G", 
     volume = "13", 
     year = "1992", 
}

Problems: 41