I. V. Liskina, O. I. Shpak, L. M. Zagaba, V. B. Bychkovskiy, and M. F. Yatsina, “Efficacy of histological and cytological examination under different methods of sampling biopsies at endoscopy in patients with respiratory pathology”, Zaporozhye Medical Journal, vol. 18, no. 1, Mar. 2016.