@article{zu223785, volume = {49}, number = {6}, title = {?????????? ??????? ??? ??????? ??? ??????????? ?????????? ???????????????? ?????? ????????}, author = {?. ?. ????????? and ?. ?. ????? and ?. ?. ???????? and ?. ?. ????????}, year = {1983}, pages = {634--636}, journal = {?????????? ?????????? ??????}, url = {http://eprints.zu.edu.ua/23785/} }