Giannasio, Benedetta, et al. “Patient-Perceived Outcomes of Different Anaesthetic Techniques in Classical Surgical Treatment of Varicose Veins of Lower Limbs”. Annali Italiani Di Chirurgia, vol. 88, no. 6, Nov. 2017, pp. 534-8, https://annaliitalianidichirurgia.it/index.php/aic/article/view/2384.