Barnes, R W Noninvasive quantitation of deep venous incompetence: primary vs secondary varicose veins. [electronic resource] - Surgical forum 1974 - 252-4 p. digital Publication Type: Journal Article ISSN: 0071-8041 Subjects--Topical Terms: Blood Flow VelocityBlood PressureHumansPhlebitis--complicationsPhlebographyVaricose Veins--diagnosis