Tham khảo Bài_toán_tối_ưu_hóa

  1. ↑ Boyd, Stephen P.; Vandenberghe, Lieven (2004).
  2. ↑ Ausiello, Giorgio; et al. (2003), Complexity and Approximation (Corrected ed.
  3. 1 2 Hromkovic, Juraj (2002), Algorithmics for Hard Problems, Texts in Theoretical Computer Science (2nd ed.
  4. ↑ Kann, Viggo (1992), On the Approximability of NP-complete Optimization Problems, Royal Institute of Technology, Sweden, ISBN 91-7170-082-X