@article{zu217735,
          volume = {57},
          number = {7},
           title = {?????????????? ???????????? ? ???????????? ?????????? ? ?????????? ???????},
          author = {?. ?. ??????? and ?. ?. ?????? and ?. ?. ??????},
            year = {1987},
           pages = {1534--1540},
         journal = {?????? ????? ?????},
             url = {http://eprints.zu.edu.ua/17735/}
}