@article{zu217737,
          volume = {60},
          number = {4},
           title = {??????????? ????????????????????????????? ? ?????????? ???????. ?????? ??????????????????????},
          author = {?. ?. ??????? and ?. ?. ?????? and ?. ?. ???????? and ?. ?. ???????},
            year = {1990},
           pages = {804--807},
         journal = {?????? ????? ?????},
             url = {http://eprints.zu.edu.ua/17737/}
}