Zadorozhna, V.Z. and Tsyganchuk, O.M. 2017. POLIO: NEW CHALLENGES ON THE WAY TO ERADICATION. Infectious Diseases – Infektsiyni khvoroby. 4 (Feb. 2017), 5–12. DOI:https://doi.org/10.11603/1681-2727.2016.4.7206.