@article{zu215775,
           title = {?? ????? ????????????? ?????? ?????????? ????????? ???????????????? ???????????? ???????? 2-?? ???????},
          author = {?. ?. ?????? and ?. ?. ??????},
            year = {1987},
         journal = {?????????? ????????? ? ?????????? ???????},
             url = {http://eprints.zu.edu.ua/15775/}
}