@article{zu222885, title = {??????????? ??????????? ? ???????? ?????????? ??????? ?? ?????????? ???????? ? ????????? ??????????? ??????????? ????? ? ???????? ?????}, author = {?. ?. ??????}, publisher = {????-???}, year = {1991}, pages = {67--69}, journal = {?????????? ????????, ????????, ????. ?????? ????????}, url = {http://eprints.zu.edu.ua/22885/} }