@article{zu225681, number = {5}, month = {????????}, author = {?. ?. ??????? and ?. ?. ??????? and ?. ?. ????}, title = {????? ?????? ?????????? ?? ???????? ? ??????????? ? ?????? ???????}, publisher = {???-?? ?.?.??????, ???????}, journal = {????????? ??????? ???????? ???????????}, pages = {21--23}, year = {2017}, url = {http://eprints.zu.edu.ua/25681/} }