SAMALAVIČIUS, Narimantas Evaldas, et al. “Transanal Endoscopic Microsurgery: Results of the First 50 Cases”. Acta Medica Lituanica, vol. 19, no. 1, Mar. 2012, pp. 45-49, https://doi.org/10.6001/actamedica.v19i1.2309.