@article{Murty1968, 
     author = "Murty, K. G.", 
     doi = "10.1287/opre.16.3.682", 
     issn = "0030-364X", 
     journal = "Operations Research", 
     link = "http://pubsonline.informs.org/doi/abs/10.1287/opre.16.3.682", 
     number = "3", 
     pages = "682--687", 
     title = "Letter to the Editor--An Algorithm for Ranking All the Assignments in Order of Increasing Cost", 
     uri = "http://pubsonline.informs.org/doi/abs/10.1287/opre.16.3.682", 
     volume = "16", 
     year = "1968", 
}

Problems: 90