@article{zu225773, number = {5}, month = {????????}, author = {?. ?. ??????}, title = {???????????? ?????????? ??????????? ?????????? ? ??????}, publisher = {???-?? ?.?.??????, ???????}, journal = {????????? ??????? ???????? ???????????}, pages = {241--243}, year = {2017}, url = {http://eprints.zu.edu.ua/25773/} }