@article{zu21518, number = {13}, title = {???? ??????? ??? ?????????? ?????????? ???????? ???????? ? ?????? ???????????? ???????????? ???????????? ??????????}, author = {?. ?. ????????}, year = {2003}, pages = {131--134}, journal = {?????? ????????????? ?????????? ???????????? ????? ????? ??????}, url = {http://eprints.zu.edu.ua/1518/}, abstract = {? ?????? ????? ????????? ?????????? ???????? ???????? ? ?????? ???????????? ???????????? ??????????.} }