@article{zu25950,
          volume = {77},
          number = {6},
          author = {?????? ??????????? and ????????? ???????????},
           title = {?????????? ???? ?? ?????? ???????????? ????????????? ???????},
       publisher = {?????????},
         journal = {??????????},
           pages = {30--35},
            year = {2008},
             url = {http://eprints.zu.edu.ua/5950/}
}