@article{zu218507, number = {2(13)}, title = {???????????????? ??????????? ???????????????? ? ????????? ????????? ? ?? ???????? ?? ??????????? ? ??????????????????? ??????? ??????????}, author = {?. ?. ??????}, publisher = {????????????? ??????????????? ???????????}, year = {2013}, pages = {303--306}, journal = {?????? ????? ???}, url = {http://eprints.zu.edu.ua/18507/} }