@article{zu227029, number = {9}, month = {????????}, title = {????? ??????? ???????????? ???-?????????? ? ?????? ????????????? ??????????? ???????}, author = {?. ?. ???????}, year = {2018}, pages = {158--160}, journal = {??????? ???????????? ?????????? ? ?????? ? ?????}, url = {http://eprints.zu.edu.ua/27029/} }