@article{zu218454,
          volume = {20},
          number = {6},
           title = {??????????? ?????????? ??????? ??????????????? ????? ?????????? ?????},
          author = {?. ?. ???????? and ?. ?. ?????? and ?. ?. ??????????},
            year = {1977},
           pages = {878--881},
         journal = {????? ? ?????????? ??????????},
             url = {http://eprints.zu.edu.ua/18454/},
        abstract = {????????????? ??????????????? ??????????? ?????? ? ???????????? ????????? ?????????? {--} ?????? ????????? ??????????, ??? ??? ?????????? ??????????? ???????? ???????? ? ???????? ?????? ??????? ? ?????? ?????? ?????????? ???????????? ?????????? ???????? ??????. ??? 60?? ???? ??????? ?????????? ?????????? ?????? ????????????????? ?? ????????? ???????? ????????, ??? ???????? ? ????????? ???????????? ????? ??????? ????? ? ? ????????? ??????? ???????????.}
}