R. Gonçalves Pereira, J. Tiago, G. Cabral, T. Costa, G. Rossello, and D. Cunha e Sá, “RECURRENT VARICOSE VEINS FOLLOWING SMALL SAPHENOUS VEIN SURGERY: A 5-YEAR FOLLOW-UP DUPLEX ULTRASOUND STUDY”, Rev Port Cir Cardiotorac Vasc, vol. 28, no. 3, pp. 39–46, Nov. 2021.