21? ?? ???????? ??? ?????? ??(??·???)? ????.
1965? ??? ?? ??? ? ??? ??? ?????? ???? ? ????? ???????? ?? ??? ????.
??? ??? ???? ???? ? ??? ?? 20? ???? ????? ??? ????. ?? 21? ???? ??? ??? ??? ???? ????.
Δ1965? ?? ?? ?? Δ??? ????? ?? Δ??? ???????? ?? Δ?????? ???? Δ?????? ??? Δ?????? ??????????? Δ?20·21? ????
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