translation: Trevisan, Luca; Sorkin, Gregory; Sudan, Madhu; Williamson, David (2000 ), " Gadgets, Approximation, and Linear Programming ", Proceedings of the 37th IEEE Symposium on Foundations of Computer Science: 617-626.
translation: Truy cập ngày 6 tháng 9 năm 2011. Trevisan, Luca; Sorkin, Gregory; Sudan, Madhu; Williamson, David (2000 ), " Gadgets, Approximation, and Linear Programming ", Proceedings of the 37th IEEE Symposium on Foundations of Computer Science: 617-626 .