??????? paratungstate ???? ?????? ??? ???? ?????? ????, ??? ?? 4xy. ???? 4 (?????? ??????), ?????? ?????? ????? ??????? ?? ??? ???? ????? ????? ?? ?????? ???? ????????? ?????;
x: ?????? ???? (????? ?????);
y: ?????? ???? (??? ?????).

???????? ???? ?? ??????? ??????? ?? ??? ??????? ?????????? ????? ????? ?????? ?? ?????? ??????? ?? ????? ??? ???? ????????. ????? ????? ?????? ??? ??? ????? ??????? ?? ?????? ??? ????? ?????.

"????????? ?????? ?? ??? ??? ?????? ?????? ???????? ????" (?????? ????? ?? ?? ???? ?? '219) ???? ?? ????? ????? ?????? ??????? ?????? ?? ??????? ???????? ?? ?? ?? ??? ?? ????? ???, ????? , ??????, ????? ?????, ???? ????? ?? ????? ??? ????? ???? ?? ??????? ????????, ???? ????? ??????, ??????.

??? ?????, ????? ????, ?????? ?????? ?? ?????? ???????? ???? ??????? ??????????? ??? ????? ?????. ????? ??, ??? ??? ????? ?????? ????? ????? ??? ?????? ????????? ?? ???? / ???? ?? ??????. ?? ???, ??? ????? ?????? ????? ?????? ?????? ????? ??????? ???? ????? ??? ??????? ??? ?? ?????, ???? ??????? ????? ???????? ????? ??? ???? ???, ????? ?????? ???? ??????? ????????? ????? ?????? ?? ?????? ???? ??????? ????. ??? ?? ??? ????? ?? ??? ?????? ????? ?? ???, ?????? ????? ?? ????? ????? ????? ???? ????? ???? ????? ???????? ??? ????? ????, ????? ?????? ????? ???? ?????? ?????? ???? ???? ???? ?????? ????? ???.