@article{zu217173, number = {8}, title = {??? ???????? ? ??????????-???????????? ????}, author = {???? ?????? and ?. ?. ??????}, publisher = {??? ??.?.??????}, year = {2015}, pages = {61--63}, journal = {???????? ????? ??????? ???????????}, url = {http://eprints.zu.edu.ua/17173/} }