@article{zu214150, title = {???????? ?????? ?????????? ? ??????????????????? ????????????? }, author = {?. ?. ????????? and ?. ?. ???????}, year = {2013}, pages = {165--168}, journal = {?????????? ???????????. ? 2013: ????????? IV ????.-???????. ??????. ????.}, url = {http://eprints.zu.edu.ua/14150/} }