@article{Yen1971, 
     author = "Yen, J. Y.", 
     doi = "10.1287/mnsc.17.11.712", 
     issn = "0025-1909", 
     journal = "Management Science", 
     link = "http://pubsonline.informs.org/doi/abs/10.1287/mnsc.17.11.712", 
     number = "11", 
     pages = "712--716", 
     title = "Finding the K Shortest Loopless Paths in a Network", 
     uri = "http://pubsonline.informs.org/doi/abs/10.1287/mnsc.17.11.712", 
     volume = "17", 
     year = "1971", 
}

Problems: 121