@article{zu225552, number = {1}, month = {?????}, author = {?. ?. ??????}, title = {???????????? ?? ?????????? ?????? ?????????? ??????????}, publisher = {???-?? ??? ????? ????? ??????}, journal = {????????? ???????? ???????? ??????????? ?? ???????? ?????????? ???? ? ??????????}, pages = {171--176}, year = {2015}, url = {http://eprints.zu.edu.ua/25552/} }