Боковнев О. А. Выпуклые и невыпуклые фигуры. — 1973
Боковнев О. А. Выпуклые и невыпуклые фигуры : диафильм по математике для 6 класса. — М. : студия «Диафильм», 1973. — [4], 31 кадров.
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