Ismail, I., D. A. Tobing, A. Bachtiar, U. P. Siregar, and K. L. Tambunan. “Protein C, Protein S, Antithrombin III, and Hyperfibrinogenemia in Deep Vein Thrombosis (DVT) Among Patients Who Underwent High Risk Orthopaedic Surgery”. Medical Journal of Indonesia, vol. 13, no. 1, Feb. 2004, pp. 24-30, doi:10.13181/mji.v13i1.130.