Bibtex of ZZZ (working) / String

@article{Proskurowski1998, 
     author = "Proskurowski, Andrzej and Ruskey, Frank and Smith, Malcolm", 
     doi = "10.1137/S0895480192234009", 
     issn = "0895-4801", 
     journal = "SIAM Journal on Discrete Mathematics", 
     keyword = "05A15,05C30,60J10,68Q25,68R05,68R15,Stirling numbers,combinatorial generation,k-ary strings,k-paths,restricted growth function", 
     language = "en", 
     link = "http://epubs.siam.org/doi/abs/10.1137/S0895480192234009", 
     month = "feb", 
     number = "1", 
     pages = "94--109", 
     publisher = "Society for Industrial and Applied Mathematics", 
     title = "Analysis of Algorithms for Listing Equivalence Classes of k -ary Strings", 
     uri = "http://epubs.siam.org/doi/abs/10.1137/S0895480192234009", 
     volume = "11", 
     year = "1998", 
}