@inproceedings{zu221642,
       booktitle = {????????????? ???????? ?????? ? ????? ????? ? ?????? ?????????? ??????},
           title = {?????????? ?? ???? ????? ???????},
          author = {?. ?. ???????? and ?. ?. ???????? and ?. ?. ??????????},
            year = {1998},
           pages = {167--171},
             url = {http://eprints.zu.edu.ua/21642/}
}