@inproceedings{zu221520,
       booktitle = {????????????? ???????? ?????? ? ????? ????? ? ?????? ?????????? ??????},
           title = {????????????????? ? ????????????????? ? ?????????? ?????????? ??????????? ???????},
          author = {?. ?. ??????? and ?. ?. ???????? and ?. ?. ??????????},
            year = {1998},
           pages = {175--180},
             url = {http://eprints.zu.edu.ua/21520/}
}