@article{zu217738, volume = {27}, number = {11}, title = {?????? ??????? ?????? ?????? ?? ???????????? ? ???????????? ? ?????????? ???????}, author = {?. ?. ??????? and ?. ?. ?????? and ?. ?. ???????? and ?. ?. ???????}, year = {1991}, pages = {2441--2445}, journal = {?????? ???????????? ?????}, url = {http://eprints.zu.edu.ua/17738/} }