@book{papadimitriou2013combinatorial,
  title={Combinatorial Optimization: Algorithms and Complexity},
  author={Papadimitriou, C.H. and Steiglitz, K.},
  isbn={9780486320137},
  series={Dover Books on Computer Science},
  url={https://books.google.com/books?id=BSPCAgAAQBAJ},
  year={2013},
  publisher={Dover Publications}
}