1. The operative treatment of varicose veins;Lofgren,1976
2. Doppler ultrasound in the investigation of venous insufficiency;Nicolaides,1981
3. Assessment of venous valve function by duplex scan;Sandager;Bruit,1986
4. Duplex scanning in the assessment of deep venous incompetency;Szendro;J Vasc Surg,1986
5. Ambulatory venous pressure: new informations;Nicolaides,1981