1. Trial of ultrasound in the treatment of chronic leg ulceration;Callam,1992
2. Trial of ultrasound in the treatment of chronic leg ulceration;Callam,1986
3. A controlled trial of weekly ultrasound therapy in chronic leg ulceration;Callam;The Lancet,1987
4. Stimulation of healing of varicose ulcers by ultrasound;Dyson;Ultrasonics,1976
5. A placebo controlled trial of ultrasound therapy in chronic leg ulceration;Eriksson;Scandinavian Journal of Rehabilitation Medicine,1991