Joffe, S.N., Immelman, E.J., and Louw, J.H.: The Incidence of Postoperative Deep Vein Thrombosis. S. Afr. J. Surg., 2: 107, 1973.
2.
Kakkar, V.V. : The Diagnosis of Deep Vein Thrombosis Using the 125I-Fibrinogen Test. Arch. Surg., 104: 152, 1972 .
3.
Kemble, J.V.H. : Incidence of Deep Vein Thrombosis. Brit. J. Hosp. Med., 6: 721, 1971
4.
Strandness, D.E., and Summer, D.S.: Ultrasonic Velocity Detector in the Diagnosis of Thrombophlebitis. Arch. Surg.104: 180, 1972 .
5.
Yao, S.T., Gourmos, C., and Hobbs, J.T.: Detection of Proximal Vein Thrombosis by Doppler Ultrasound Flow Detection Method. Lancet,1: 1, 1972.
6.
Kakkar, V.V. , Corrigon, T., Spindler , J., Fossard, D.P., Flute, P.T., Crellin, R.Q., Wessler, S., and Yin, E.T.: Efficacy of Low Doses of Heparin in Prevention of Deep Vein Thrombosis after Major Surgery . Lancet,2: 101, 1972.
7.
Gordon-Smith, I.C., Grundy, D.J., LeQuesne , L.P., Newcombe, J. FM, and Bramble , F.J.: Controlled Trial of Two Regimens of Subcutaneous Heparin in Prevention of Postoperative Deep Vein Thrombosis. Lancet,1: 1133, 1972.