@article{zu229645, month = {????????}, title = {???????????? ?????????? ???????? ?????????????? ?????????????? ????????? ??????????}, author = {?. ?. ?????????}, publisher = {??? ??. ?. ??????}, year = {2019}, pages = {159--161}, journal = {????????? ???????? ????????????? ????????? (??????? ???????? ?????)}, url = {http://eprints.zu.edu.ua/29645/} }