1. Arnoldi CC (1966) The venous pump of the calf: A study on healthy human subjects and patients with venous insufficiency. Thesis, Umeå
2. Aschberg SA (1973) Crural venous obstruction or incompetence: A comparative study of the diagnostic value of clinical examination, venography and plethysmography. Acta Chir Scand (Suppl) 436
3. Bjordal RI (1977) Haemodynamic studies of varicose veins and the post-thrombotic syndrome. In: The treatment of venous disorders, Hobbs, JT (ed). p 37
4. Calnan JS, Koutz S, Pentecost BL, Shillingford JP, Steiner RE (1964) Venous obstruction in the aetiology of lymphoedema praecox. Br Med J 2:221–226
5. Eiriksson E (1968) Plethysmographic studies of venous diseases of the legs. Acta Chir Scand (Suppl) 398