@article{zu226696, number = {3}, title = {???????? ?????, ???? ????? ?? ??????? ??????? ?????? ????????}, author = {?. ?. ?????????}, publisher = {??? ????? ????? ??????}, year = {2013}, pages = {169--173}, journal = {???????????? ???????}, url = {http://eprints.zu.edu.ua/26696/} }